That post of @manup from FEB 2024 did the trick for me.
I dont know why but the flasher is not able to start if the Stick is plugged in if you enter the command. it only starts if you put in the stick hit the command unplug the stick and put it back in.
Successful flash
Path | Serial | Type
------------------±------------±--------------
COM8 | DExxxxxxxx | ConBee III
D:\Downloads\GCFFlasher_Win_V4_09_00\GCFFlasher_Win_V4_09_00>GCFFlasher -d COM8 -t 60 -f deCONZ_ConBeeIII_0x26550900.bin.GCF
read file success: deCONZ_ConBeeIII_0x26550900.bin.GCF (198814 bytes)
flash firmware
connect \.\COM8, baudrate 115200
command reset timeout
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
retry connect bootloader COM8
connect \.\COM8, baudrate 115200
query bootloader id V3
query bootloader id V3
query bootloader failed
retry: 39 seconds left
read file success: deCONZ_ConBeeIII_0x26550900.bin.GCF (198814 bytes)
flash firmware
query bootloader id V3
bootloader version 0x00010004, app crc 0xB2D7753C
100% uploading #############################################################
done, wait (up to 20 seconds) for verification
app checksum 0xB2D7753C (OK)
finished
The Web updater for the firmware also doesn’t work for my conbee III. after selecting the device the adress in browser change to /#updatefailed with no percentage and nothing happening.
Updating
The firmware is now being programmed to the ConBee III.
% done.
could this be a general problem?