nRF51 replaced (new blank chip) on Crazyflie 2.1+. Need help flashing bootloader/firmware via ST-Link v2 + debug header

[HamzaShabbir517]

Hi everyone,

I had an issue where the original nRF51 IC on my Crazyflie 2.1+ got physically damaged on the pin side. I successfully desoldered it and soldered a new nRF51822 chip in its place.

The new chip is completely empty (no SoftDevice, no bootloader, no firmware). Because of this, I cannot enter bootloader mode using the cfclient (no radio communication possible).

Since the nRF51 is blank, what is the correct procedure and which files/hexes do I need to flash to bring it back to a working state?
From what I’ve read in the repositories, it seems I need to flash:

SoftDevice (S130)
nRF51 Bootloader
nRF51 Firmware

Should I use make factory_reset from the crazyflie2-nrf-firmware repository?

Any detailed step-by-step guidance would be greatly appreciated (especially the correct OpenOCD commands or Makefile targets for a completely blank chip).

Thanks in advance!

[tobbeanton]

Sorry, we can't help you restore it but the offer of a free used replacement board still stands. Let us know in the email discussion.