Unable to flash firmware to ConBee 2

[BurningTheSky]

I am trying to flash an older version of the ConBee firmware onto my stick as recommended for use with Zigbee2MQTT but I am having issues. I am trying to flash from Win11 and have tried multiple versions of GCFFlasher without success. I am running Windows not in a vm and the ConBee connected direct to the host and the terminal window is running as admin

For v3.17 I get the following:

PS C:\Users\burningsky\Downloads\GCFFlasher_Win_V3_17\GCFFlasher_V3_17> .\GCFFlasher.exe -l
GCFFlasher V3_17 (c) dresden elektronik ingenieurtechnik gmbh
Path             | Vendor | Product | Serial     | Type
-----------------+--------+---------+------------+-------
\\.\COM5         | 0x1CF1 | 0x0030  | DE228xxxx  | ConBee II
PS C:\Users\burningsky\Downloads\GCFFlasher_Win_V3_17\GCFFlasher_V3_17> .\GCFFlasher.exe -d COM5 -t 60 -f deCONZ_ConBeeII_0x26580700.bin.GCF
GCFFlasher V3_17 (c) dresden elektronik ingenieurtechnik gmbh
Reboot device COM5 (ConBee II)
deCONZ firmware version 26720700
failed reset 19241
Reboot device COM5 (ConBee II)
deCONZ firmware version 26720700
failed reset 19226
retry, failed

2411: Error: uart reset failed, check retry

For v4.03 I get this endlessly:

PS C:\Users\burningsky\Downloads\GCFFlasher_Win_V4_03_00> .\GCFFlasher.exe -l
Path              | Serial      | Type
------------------+-------------+---------------
COM5              | DE228xxxx   | ConBee II
PS C:\Users\burningsky\Downloads\GCFFlasher_Win_V4_03_00> .\GCFFlasher.exe -d COM5 -t 60 -f deCONZ_ConBeeII_0x26580700.bin.GCF
read file success: deCONZ_ConBeeII_0x26580700.bin.GCF (160944 bytes)
flash firmware
connect \\.\COM5, baudrate 115200
command UART reset done
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5
connect \\.\COM5, baudrate 115200
retry connect bootloader COM5

[manup]

Hi sorry for the late reply, this looks a bit like there is not running firmware on the device and hence the reset command is not processed. I've added a small workaround to the Wiki how do make the reset manually in the Wiki: FAQ

What if ConBee (all Versions) still refuses to flash

There might be occasions where the stick still refuses to flash. In that case:

• Unplug the ConBee and wait 10 seconds
• Issue the command to flash, make sure you you've selected the correct device on your system for the -d parameter and also ensure to use -t 60 -x 3
• Attach the ConBee again

Hope that helps