diff --git a/bin/device-install.sh b/bin/device-install.sh
index 3b1bd50f2..85e39892e 100755
--- a/bin/device-install.sh
+++ b/bin/device-install.sh
@@ -1,13 +1,13 @@
 #!/bin/sh
 
-PYTHON=${PYTHON:-python3}
+PYTHON=${PYTHON:-$(which python3 python|head -n 1)}
 
 set -e
 
 # Usage info
 show_help() {
 cat << EOF
-Usage: ${0##*/} [-h] [-p ESPTOOL_PORT] [-P PYTHON] [-f FILENAME]
+Usage: $(basename $0) [-h] [-p ESPTOOL_PORT] [-P PYTHON] [-f FILENAME|FILENAME]
 Flash image file to device, but first erasing and writing system information"
 
     -h               Display this help and exit
@@ -39,6 +39,11 @@ while getopts ":hp:P:f:" opt; do
 done
 shift "$((OPTIND-1))"
 
+[ -z "$FILENAME" -a -n "$1" ] && {
+    FILENAME=$1
+    shift
+}
+
 if [ -f "${FILENAME}" ]; then
 	echo "Trying to flash ${FILENAME}, but first erasing and writing system information"
 	$PYTHON -m esptool --baud 921600 erase_flash
diff --git a/bin/device-update.sh b/bin/device-update.sh
index 98eff9d10..dda05f005 100755
--- a/bin/device-update.sh
+++ b/bin/device-update.sh
@@ -1,11 +1,11 @@
 #!/bin/sh
 
-PYTHON=${PYTHON:-python3}
+PYTHON=${PYTHON:-$(which python3 python|head -n 1)}
 
 # Usage info
 show_help() {
 cat << EOF
-Usage: ${0##*/} [-h] [-p ESPTOOL_PORT] [-P PYTHON] -f FILENAME
+Usage: $(basename $0) [-h] [-p ESPTOOL_PORT] [-P PYTHON] [-f FILENAME|FILENAME]
 Flash image file to device, leave existing system intact."
 
     -h               Display this help and exit
@@ -37,6 +37,11 @@ while getopts ":hp:P:f:" opt; do
 done
 shift "$((OPTIND-1))"
 
+[ -z "$FILENAME" -a -n "$1" ] && {
+    FILENAME=$1
+    shift
+}
+
 if [ -f "${FILENAME}" ]; then
 	echo "Trying to flash update ${FILENAME}."
 	$PYTHON -m esptool --baud 921600 write_flash 0x10000 ${FILENAME}