I've was able to use brand new PPK2 to make test measurements few days ago and it was working fine. I've connected the unit today and software have issue recognising the device. I unplugged and plugged PPK2 back into USB and it never turned green, blinking fast red. I've followed instructions to short TP34 and ground. The kit shows up in nRF Connect and I click "Yes" to update firmware but device never comes back. I've tried mac and windows and never was able to successfully update the firmware.
20:29:46.768
Application data folder: /Users/vladimir/Library/Application Support/nrfconnect/pc-nrfconnect-ppk
20:29:50.352
Validating firmware for device with s/n FD8ECA4121AB
20:29:52.760
Error while setting up device FD8ECA4121AB: Error message for known response code from DFU target: Opcode unknown or not supported.
20:29:52.761
Deselecting device
20:29:57.864
Validating firmware for device with s/n FD8ECA4121AB
20:29:59.136
Error while setting up device FD8ECA4121AB: Error Resource temporarily unavailable Cannot lock port
20:29:59.137
Deselecting device
