diff --git a/bin/platformio-custom.py b/bin/platformio-custom.py
index 951d89b0..de9ce120 100644
--- a/bin/platformio-custom.py
+++ b/bin/platformio-custom.py
@@ -1,17 +1,69 @@
-
-
 import subprocess
 import configparser
 import traceback
 import sys
+from os.path import join
 from readprops import readProps
 
+Import("env")
+platform = env.PioPlatform()
+sys.path.append(join(platform.get_package_dir("tool-esptoolpy")))
+import esptool
+
+def esp32_create_combined_bin(source, target, env):
+    # this sub is borrowed from ESPEasy build toolchain. It's licensed under GPL V3
+    # https://github.com/letscontrolit/ESPEasy/blob/mega/tools/pio/post_esp32.py
+    print("Generating combined binary for serial flashing")
+
+    app_offset = 0x10000
+
+    new_file_name = env.subst("$BUILD_DIR/${PROGNAME}.factory.bin")
+    sections = env.subst(env.get("FLASH_EXTRA_IMAGES"))
+    firmware_name = env.subst("$BUILD_DIR/${PROGNAME}.bin")
+    chip = env.get("BOARD_MCU")
+    flash_size = env.BoardConfig().get("upload.flash_size")
+    flash_freq = env.BoardConfig().get("build.f_flash", '40m')
+    flash_freq = flash_freq.replace('000000L', 'm')
+    flash_mode = env.BoardConfig().get("build.flash_mode", "dio")
+    memory_type = env.BoardConfig().get("build.arduino.memory_type", "qio_qspi")
+    if flash_mode == "qio" or flash_mode == "qout":
+        flash_mode = "dio"
+    if memory_type == "opi_opi" or memory_type == "opi_qspi":
+        flash_mode = "dout"
+    cmd = [
+        "--chip",
+        chip,
+        "merge_bin",
+        "-o",
+        new_file_name,
+        "--flash_mode",
+        flash_mode,
+        "--flash_freq",
+        flash_freq,
+        "--flash_size",
+        flash_size,
+    ]
+
+    print("    Offset | File")
+    for section in sections:
+        sect_adr, sect_file = section.split(" ", 1)
+        print(f" -  {sect_adr} | {sect_file}")
+        cmd += [sect_adr, sect_file]
+
+    print(f" - {hex(app_offset)} | {firmware_name}")
+    cmd += [hex(app_offset), firmware_name]
+
+    print('Using esptool.py arguments: %s' % ' '.join(cmd))
+
+    esptool.main(cmd)
+
+env.AddPostAction("$BUILD_DIR/${PROGNAME}.bin", esp32_create_combined_bin)
+
 Import("projenv")
 
 prefsLoc = projenv["PROJECT_DIR"] + "/version.properties"
 verObj = readProps(prefsLoc)
 print("Using meshtastic platformio-custom.py, firmware version " + verObj['long'])
-# print("path is" + ','.join(sys.path))
 
 # General options that are passed to the C and C++ compilers
 projenv.Append(CCFLAGS=[