Unable to flash Conbee 3

Hi there,

I am trying to use my (never before used) Conbee 3 for Thread, according to OpenThread documentation (sorry, German version, but I guess you get the drift). Unfortunately, I seem to be unable to flash any firmware on this stick. I tried the Online FW Updater as well as GCFFlasher. I tried both, the recent Thread as well as the recent deCONZ firmware, I tried two different PCs. I tried also the tipps from Update deCONZ manually · dresden-elektronik/deconz-rest-plugin Wiki · GitHub (that’s why the following run of GCCFlasher does not connect at first, because I plugged the Stick in after starting it). Here the output of GCFFlasher:

.\GCFFlasher.exe -d COM3 -t 60 -f .\ot-rcp-cb3_0x01000900.GCF -x 3
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
connect \\.\COM3, baudrate 115200
failed to connect serial com
command reset timeout
connect \\.\COM3, baudrate 115200
retry connect bootloader COM3
connect \\.\COM3, baudrate 115200
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader failed
retry: 44 seconds left
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
send uart reset
send: C00B03000C0005002602000000B9FFC0 (16)
recv_packet: 81820400010050261D1D (10)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader failed
retry: 38 seconds left
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
send uart reset
send: C00B03000C0005002602000000B9FFC0 (16)
recv_packet: 81820400010050261D1D (10)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader failed
retry: 32 seconds left
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
send uart reset
send: C00B03000C0005002602000000B9FFC0 (16)
recv_packet: 81820400010050261D1D (10)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader failed
retry: 25 seconds left
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
send uart reset
send: C00B03000C0005002602000000B9FFC0 (16)
recv_packet: 81820400010050261D1D (10)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader id V3
send: C081027DFFC0 (6)
query bootloader failed
retry: 19 seconds left
read file success: .\ot-rcp-cb3_0x01000900.GCF (99262 bytes)
flash firmware
send uart reset
send: C00B03000C0005002602000000B9FFC0 (16)
recv_packet: 81820400010050261D1D (10)

That’s when I stopped it. Does anyone have any ideas?

BR

Markus