diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ef4d4e..37ae3c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,10 +2,20 @@
 
 The following is a history of the changes made to this project.
 
-## v2.8.0 *(June 24th, 2024)*
+## v2.8.1 *(in development)* :hatched_chick:
 
 ### Installers
 
+* Plane Finder Feeder now installs properly on aarch64 operating systems.
+
+### Portal
+
+* Fix problem where multiple instances of flights.py and maintenance.py were being launched.
+* Addressed portal map centering settings not being added to the database on fresh installs.
+* An issue was addressed allowing existing receivers to upgrade to phoenix properly.
+
+## v2.8.0 *(June 24th, 2024)* :hatching_chick:
+
 * The dump1090-fa and piaware_builder install process has been updated to support the latest versions.
 * The dump978 script has been rewritten in order to use FlightAwares version of dump978.
 * The Beast Splitter script has been updated to work with the current version of Beast Splitter.
@@ -22,9 +32,6 @@ The following is a history of the changes made to this project.
 * Removed the option to install AboveTustin.
 * Removed the option to install ADSBHub support due to the fact it was incomplete.
 * Removed incomplete RTL-SDR OGN setup scripting.
-
-### Portal
-
 * The portal install scripts have been updated to work on current operation systems.
 * All portal related Python scripts have been updated to work with Python 3.
 * TinyMCE has been replace by CKeditor in the portal.
diff --git a/CREDITS.md b/CREDITS.md
index 727fc20..a9b9dce 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -7,26 +7,34 @@ directly. Their time and effort is greatly appreciated by myself as well as many
 
 **Direct Contributors**
 
-* @adamkaplan
-* @atbPy
-* @charlie-foxtrot
-* @dschaper
-* @g0wfv
+* @mgunther68
 * @jdwall
 * @leearmstrong
-* @mgunther68
-* @Romeo-Golf
-* @target-drone
-* @vitaliy-sk
 * @wiedehopf
+* @vitaliy-sk
+* @target-drone
+* @dschaper
+* @adamkaplan
+* @charlie-foxtrot
+* @jsloyer
+* @kylegordon
+* @BudBundi
+* @kuchel77
+* @atbPy
+* @g0wfv
+* @ttsak
+* @mkrzysztofowicz
+* @espinielli
+* @bitpixdigital
+* @Romeo-Golf
+* @g0wfv
 
 I would like to thank the members and contributors to the following forums for all the time and effort
 they have put in in order to create a useful and informative place to discuss aircraft tracking.
 
-* The ADS-B Receiver Project Forums:  https://www.adsbreceiver.net
 * The FlightAware Forums:             http://discussions.flightaware.com
 * The PlaneFinder Forums:             http://forum.planefinder.net
-* The ADS-B Exchange Forums:          http://www.adsbexchange.com/forums/
+* The ADS-B Exchange Forums:          https://adsbx.discourse.group
 
 The performance graphs were created thanks in part to the great contributions made by members of both
 the FlightAware and PlaneFinder communities. Through their examples and help posted to the following
@@ -37,15 +45,12 @@ threads myself and a couple contributors were able to add these very informative
 
 ## Third Party Software
 
-Thanks to the people over at JetBrains for the complementary licenses for PhpStorm and PyCharms which
-is being used to develop the portal portion of this project. https://www.jetbrains.com
-
-I would also like to thank the developers and contributors to the following projects. Without their
+I would like to thank the developers and contributors to the following projects. Without their
 hard work and dedication this project would not have been possible.
 
 * Dump1090 (fa):              https://github.com/flightaware/dump1090
 * Dump978 (fa):               https://github.com/flightaware/dump978
-* FlightAware's PiAware:      http://flightaware.com
+* FlightAware's PiAware:      https://github.com/flightaware/piaware
 * Plane Finder ADS-B Client:  https://planefinder.net
 * Flightradar24 Client:       https://www.flightradar24.com
 * Dump1090-Tools:             https://github.com/mutability/dump1090-tools
diff --git a/LICENSE.md b/LICENSE.md
index dbaa60b..abf87f9 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015-2017 Joseph A. Prochazka
+Copyright (c) 2015-2024 Joseph A. Prochazka
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/bash/feeders/planefinder.sh b/bash/feeders/planefinder.sh
index 359cf20..a74f878 100755
--- a/bash/feeders/planefinder.sh
+++ b/bash/feeders/planefinder.sh
@@ -65,6 +65,15 @@ fi
 echo -e "\e[95m  Installing packages needed to fulfill dependencies for PlaneFinder ADS-B Client...\e[97m"
 echo -e ""
 CheckPackage wget
+
+# Some architectures require additional packages.
+case "${CPU_ARCHITECTURE}" in
+    "aarch64")
+        echo -e "\e[94m  Adding support for the armhf architecture...\e[97m"
+        sudo dpkg --add-architecture armhf
+        CheckPackage libc6:armhf
+        ;;
+esac
 echo ""
 
 ### DETERMINE WHICH PACACKAGE TO INSTALL
diff --git a/bash/portal/install.sh b/bash/portal/install.sh
index db11209..0cf8279 100755
--- a/bash/portal/install.sh
+++ b/bash/portal/install.sh
@@ -382,20 +382,11 @@ url.redirect += (
   "^/dump1090$" => "/dump1090/"
 )
 # Add CORS header
-server.modules += ( "mod_setenv" )
 \$HTTP["url"] =~ "^/dump1090/data/.*\.json$" {
   setenv.add-response-header = ( "Access-Control-Allow-Origin" => "*" )
 }
 EOF
 fi
-sudo tee -a /etc/lighttpd/conf-available/87-adsb-portal.conf > /dev/null <<EOF
-# Block all access to the data directory accept for local requests.
-\$HTTP["remoteip"] !~ "127.0.0.1" {
-    \$HTTP["url"] =~ "^/data/" {
-        url.access-deny = ( "" )
-    }
-}
-EOF
 
 if [[ ! -L "/etc/lighttpd/conf-enabled/87-adsb-portal.conf" ]] ; then
     echo -e "\e[94m  Enabling the Lighttpd portal configuration file...\e[97m"
diff --git a/bash/portal/logging.sh b/bash/portal/logging.sh
index 32820b7..2f0db98 100755
--- a/bash/portal/logging.sh
+++ b/bash/portal/logging.sh
@@ -33,8 +33,8 @@
 
 ## VARIABLES
 
-PORTAL_PYTHON_DIRECTORY="${RECEIVER_BUILD_DIRECTORY}/python"
-PYTHON_PATH=`which python`
+PORTAL_PYTHON_DIRECTORY="${RECEIVER_BUILD_DIRECTORY}/portal/python"
+PYTHON_PATH=`which python3`
 
 ## SETUP FLIGHT LOGGING
 
@@ -45,6 +45,6 @@ echo -e ""
 # Create the cron jobs responsible for logging and maintenance.
 echo -e "\e[94m  Creating the maintenance maintenance script...\e[97m"
 sudo tee /etc/cron.d/adsb-receiver-flight-logging > /dev/null <<EOF
-* * * * * root ${PYTHON_PATH} ${PORTAL_PYTHON_DIRECTORY}/flights.py; sleep 30; root ${PYTHON_PATH} ${PORTAL_PYTHON_DIRECTORY}/flights.py
+* * * * * root ${PYTHON_PATH} ${PORTAL_PYTHON_DIRECTORY}/flights.py
 30 * * * * root ${PYTHON_PATH} ${PORTAL_PYTHON_DIRECTORY}/maintenance.py
 EOF
diff --git a/bash/variables.sh b/bash/variables.sh
index 9fbd096..735c322 100644
--- a/bash/variables.sh
+++ b/bash/variables.sh
@@ -34,7 +34,7 @@
 ## SOFTWARE VERSIONS
 
 # The ADS-B Receiver Project
-PROJECT_VERSION="2.8.0"
+PROJECT_VERSION="2.8.1"
 
 # RTL-SDR OGN
 RTLSDROGN_VERSION="0.2.5"
diff --git a/build/portal/html/admin/index.php b/build/portal/html/admin/index.php
index f8010b0..609a3ca 100644
--- a/build/portal/html/admin/index.php
+++ b/build/portal/html/admin/index.php
@@ -73,7 +73,7 @@
             $dbh = NULL;
             foreach ($savedFlights as $flight) {
                 // Remove flight if not in list.
-                if (!in_array($flight, $notificationArray)) {
+                if (!in_array($flight, $notificationArray ?? [])) {
                     $dbh = $common->pdoOpen();
                     $sql = "DELETE FROM ".$settings::db_prefix."flightNotifications WHERE flight = :flight";
                     $sth = $dbh->prepare($sql);
diff --git a/build/portal/html/classes/template.class.php b/build/portal/html/classes/template.class.php
index 29bc1a1..ee22e50 100644
--- a/build/portal/html/classes/template.class.php
+++ b/build/portal/html/classes/template.class.php
@@ -7,7 +7,7 @@
     //                                                                                 //
     // The MIT License (MIT)                                                           //
     //                                                                                 //
-    // Copyright (c) 2015-2019 Joseph A. Prochazka                                     //
+    // Copyright (c) 2015-2024 Joseph A. Prochazka                                     //
     //                                                                                 //
     // Permission is hereby granted, free of charge, to any person obtaining a copy    //
     // of this software and associated documentation files (the "Software"), to deal   //
@@ -37,7 +37,7 @@
 
             // Check if the portal is installed or needs upgraded.
 
-            $thisVersion = "2.8.0";
+            $thisVersion = "2.8.1";
 
             if (!file_exists($_SERVER['DOCUMENT_ROOT']."/classes/settings.class.php")) {
                 header ("Location: /install/install.php");
diff --git a/build/portal/html/install/index.php b/build/portal/html/install/index.php
index 42b2808..44c8054 100644
--- a/build/portal/html/install/index.php
+++ b/build/portal/html/install/index.php
@@ -7,7 +7,7 @@
     //                                                                                 //
     // The MIT License (MIT)                                                           //
     //                                                                                 //
-    // Copyright (c) 2015-2019 Joseph A. Prochazka                                     //
+    // Copyright (c) 2015-2024 Joseph A. Prochazka                                     //
     //                                                                                 //
     // Permission is hereby granted, free of charge, to any person obtaining a copy    //
     // of this software and associated documentation files (the "Software"), to deal   //
@@ -29,7 +29,7 @@
     /////////////////////////////////////////////////////////////////////////////////////
 
     // The most current stable release.
-    $thisVersion = "2.8.0";
+    $thisVersion = "2.8.1";
 
     // Begin the upgrade process if this release is newer than what is installed.
     if (file_exists($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."classes".DIRECTORY_SEPARATOR."settings.class.php")) {
@@ -398,11 +398,11 @@ EOF;
                 $sth = $dbh->prepare($settingsSql);
                 $sth->execute();
                 $sth = NULL;
-                
+
                 $sth = $dbh->prepare($aircraftIndexSql);
                 $sth->execute();
                 $sth = NULL;
-                
+
                 $sth = $dbh->prepare($positionsIndexSql);
                 $sth->execute();
                 $sth = NULL;
@@ -444,6 +444,8 @@ EOF;
             $common->addSetting('googleMapsApiKey', '');
             $common->addSetting("hideNavbarAndFooter", FALSE);
             $common->addSetting("purgeAircraft", FALSE);
+            $common->addSetting("advancedMapCenterLatitude", "41.3683798");
+            $common->addSetting("advancedMapCenterLongitude", "-82.1076486");
 
             if ($_POST['driver'] == "xml")
                 $common->addSetting('enableFlights', FALSE);
diff --git a/build/portal/html/install/upgrade-v2.7.0.php b/build/portal/html/install/upgrade-v2.7.0.php
index eec93b5..781a9f6 100644
--- a/build/portal/html/install/upgrade-v2.7.0.php
+++ b/build/portal/html/install/upgrade-v2.7.0.php
@@ -7,7 +7,7 @@
     //                                                                                 //
     // The MIT License (MIT)                                                           //
     //                                                                                 //
-    // Copyright (c) 2015-2017 Joseph A. Prochazka                                     //
+    // Copyright (c) 2015-2024 Joseph A. Prochazka                                     //
     //                                                                                 //
     // Permission is hereby granted, free of charge, to any person obtaining a copy    //
     // of this software and associated documentation files (the "Software"), to deal   //
@@ -48,7 +48,7 @@
         $settings = new settings();
 
         try {
-            // Add portal navigation and footer autohide option.
+            // Add map centering longitude and latitude.
             $common->addSetting("advancedMapCenterLatitude", "41.3683798");
             $common->addSetting("advancedMapCenterLongitude", "-82.1076486");
 
diff --git a/build/portal/html/install/upgrade-v2.8.0.php b/build/portal/html/install/upgrade-v2.8.0.php
new file mode 100644
index 0000000..2423587
--- /dev/null
+++ b/build/portal/html/install/upgrade-v2.8.0.php
@@ -0,0 +1,68 @@
+<?php
+
+    /////////////////////////////////////////////////////////////////////////////////////
+    //                            ADS-B RECEIVER PORTAL                                //
+    // =============================================================================== //
+    // Copyright and Licensing Information:                                            //
+    //                                                                                 //
+    // The MIT License (MIT)                                                           //
+    //                                                                                 //
+    // Copyright (c) 2015-2024 Joseph A. Prochazka                                     //
+    //                                                                                 //
+    // Permission is hereby granted, free of charge, to any person obtaining a copy    //
+    // of this software and associated documentation files (the "Software"), to deal   //
+    // in the Software without restriction, including without limitation the rights    //
+    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell       //
+    // copies of the Software, and to permit persons to whom the Software is           //
+    // furnished to do so, subject to the following conditions:                        //
+    //                                                                                 //
+    // The above copyright notice and this permission notice shall be included in all  //
+    // copies or substantial portions of the Software.                                 //
+    //                                                                                 //
+    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR      //
+    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,        //
+    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE     //
+    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER          //
+    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,   //
+    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE   //
+    // SOFTWARE.                                                                       //
+    /////////////////////////////////////////////////////////////////////////////////////
+
+    ///////////////////////
+    // UPGRADE TO V2.8.0
+    ///////////////////////
+
+    // --------------------------------------------------------
+    // Updates the version setting to 2.8.0.
+    // --------------------------------------------------------
+
+    $results = upgrade();
+    exit(json_encode($results));
+
+    function upgrade() {
+        require_once($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."classes".DIRECTORY_SEPARATOR."common.class.php");
+        require_once($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."classes".DIRECTORY_SEPARATOR."settings.class.php");
+
+        $common = new common();
+        $settings = new settings();
+
+        try {
+
+            // Update the version and patch settings..
+            $common->updateSetting("version", "2.8.0");
+            $common->updateSetting("patch", "");
+
+            // The upgrade process completed successfully.
+            $results['success'] = TRUE;
+            $results['message'] = "Upgrade to v2.8.0 successful.";
+            return $results;
+
+        } catch(Exception $e) {
+            // Something went wrong during this upgrade process.
+            $results['success'] = FALSE;
+            $results['message'] = $e->getMessage();
+            return $results;
+        }
+    }
+?>
+
diff --git a/build/portal/html/install/upgrade-v2.8.1.php b/build/portal/html/install/upgrade-v2.8.1.php
new file mode 100644
index 0000000..93c5017
--- /dev/null
+++ b/build/portal/html/install/upgrade-v2.8.1.php
@@ -0,0 +1,68 @@
+<?php
+
+    /////////////////////////////////////////////////////////////////////////////////////
+    //                            ADS-B RECEIVER PORTAL                                //
+    // =============================================================================== //
+    // Copyright and Licensing Information:                                            //
+    //                                                                                 //
+    // The MIT License (MIT)                                                           //
+    //                                                                                 //
+    // Copyright (c) 2015-2024 Joseph A. Prochazka                                     //
+    //                                                                                 //
+    // Permission is hereby granted, free of charge, to any person obtaining a copy    //
+    // of this software and associated documentation files (the "Software"), to deal   //
+    // in the Software without restriction, including without limitation the rights    //
+    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell       //
+    // copies of the Software, and to permit persons to whom the Software is           //
+    // furnished to do so, subject to the following conditions:                        //
+    //                                                                                 //
+    // The above copyright notice and this permission notice shall be included in all  //
+    // copies or substantial portions of the Software.                                 //
+    //                                                                                 //
+    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR      //
+    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,        //
+    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE     //
+    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER          //
+    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,   //
+    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE   //
+    // SOFTWARE.                                                                       //
+    /////////////////////////////////////////////////////////////////////////////////////
+
+    ///////////////////////
+    // UPGRADE TO V2.8.1
+    ///////////////////////
+
+    // --------------------------------------------------------
+    // Updates the version setting to 2.8.1.
+    // --------------------------------------------------------
+
+    $results = upgrade();
+    exit(json_encode($results));
+
+    function upgrade() {
+        require_once($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."classes".DIRECTORY_SEPARATOR."common.class.php");
+        require_once($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."classes".DIRECTORY_SEPARATOR."settings.class.php");
+
+        $common = new common();
+        $settings = new settings();
+
+        try {
+
+            // Update the version and patch settings..
+            $common->updateSetting("version", "2.8.1");
+            $common->updateSetting("patch", "");
+
+            // The upgrade process completed successfully.
+            $results['success'] = TRUE;
+            $results['message'] = "Upgrade to v2.8.1 successful.";
+            return $results;
+
+        } catch(Exception $e) {
+            // Something went wrong during this upgrade process.
+            $results['success'] = FALSE;
+            $results['message'] = $e->getMessage();
+            return $results;
+        }
+    }
+?>
+
diff --git a/build/portal/html/install/upgrade.php b/build/portal/html/install/upgrade.php
index 66846bb..d43ad52 100644
--- a/build/portal/html/install/upgrade.php
+++ b/build/portal/html/install/upgrade.php
@@ -33,7 +33,7 @@
     $common = new common();
 
     // The most current stable release.
-    $thisVersion = "2.8.0";
+    $thisVersion = "2.8.1";
 
     // Begin the upgrade process if this release is newer than what is installed.
     if ($common->getSetting("version") == $thisVersion) {
@@ -178,7 +178,7 @@
     }
 
     // UPGRADE TO V2.8.0
-    if ($common->getSetting("version") == "2.8.0" && $success) {
+    if ($common->getSetting("version") == "2.7.2" && $success) {
         $json = file_get_contents("http://localhost/install/upgrade-v2.8.0.php");
         $results = json_decode($json, TRUE);
         $success = $results['success'];
@@ -186,6 +186,15 @@
         $version = "2.8.0";
     }
 
+    // UPGRADE TO V2.8.1
+    if ($common->getSetting("version") == "2.8.0" && $success) {
+        $json = file_get_contents("http://localhost/install/upgrade-v2.8.1.php");
+        $results = json_decode($json, TRUE);
+        $success = $results['success'];
+        $message = $results['message'];
+        $version = "2.8.1";
+    }
+
     require_once($_SERVER['DOCUMENT_ROOT'].DIRECTORY_SEPARATOR."admin".DIRECTORY_SEPARATOR."includes".DIRECTORY_SEPARATOR."header.inc.php");
 
     // Display the instalation wizard.
diff --git a/build/portal/python/flights.py b/build/portal/python/flights.py
index eb4714b..719efed 100644
--- a/build/portal/python/flights.py
+++ b/build/portal/python/flights.py
@@ -36,15 +36,29 @@
 # 3) Update the last time the flight was seen.
 
 import datetime
+import fcntl
 import json
-import time
 import os
+import time
+
 from urllib.request import urlopen
 
 def log(string):
     #print(string) # uncomment to enable debug logging
     return
 
+# Do not allow another instance of the script to run.
+lock_file = open('/tmp/flights.py.lock','w')
+
+try:
+    fcntl.flock(lock_file, fcntl.LOCK_EX|fcntl.LOCK_NB)
+except (IOError, OSError):
+    log('another instance already running')
+    quit()
+
+lock_file.write('%d\n'%os.getpid())
+lock_file.flush()
+
 # Read the configuration file.
 with open(os.path.dirname(os.path.realpath(__file__)) + '/config.json') as config_file:
     config = json.load(config_file)
@@ -125,7 +139,7 @@ class FlightsProcessor(object):
         log("\tFound Aircraft ID: " + str(aircraft_id))
 
         # Check that a flight is tied to this track.
-        if aircraft.has_key('flight'):
+        if 'flight'  in aircraft:
             self.processFlight(aircraft_id, aircraft)
 
     def processFlight(self, aircraft_id, aircraft):
@@ -166,7 +180,7 @@ class FlightsProcessor(object):
 
         if row == None or row[0] != aircraft["messages"]:
             # Add this position to the database.
-            if aircraft.has_key('squawk'):
+            if 'squawk' in aircraft:
                 params = (flight_id, self.time_now, aircraft["messages"], aircraft["squawk"],
                             aircraft["lat"], aircraft["lon"], aircraft["track"],
                             aircraft["nav_altitude"], aircraft["geom_rate"], aircraft["gs"], aircraft_id,)
diff --git a/build/portal/python/maintenance.py b/build/portal/python/maintenance.py
index e00a204..599e941 100644
--- a/build/portal/python/maintenance.py
+++ b/build/portal/python/maintenance.py
@@ -28,11 +28,23 @@
 # SOFTWARE.                                                                      #
 #================================================================================#
 
+import datetime
+import fcntl
 import json
 import os
-import datetime
 import time
 
+# Do not allow another instance of the script to run.
+lock_file = open('/tmp/flights.py.lock','w')
+
+try:
+    fcntl.flock(lock_file, fcntl.LOCK_EX|fcntl.LOCK_NB)
+except (IOError, OSError):
+    quit()
+
+lock_file.write('%d\n'%os.getpid())
+lock_file.flush()
+
 while True:
 
     ## Read the configuration file.