Chameleon Lite: NRF52840 HW issue. Need to reflash a new chip.

[spp2000]

Hi guys, I had an hardware issue with the NRF52840 chip. No bluetooth and no USB communication at all, while the emulation of the stored slots was still working. Reflowing the chip with hot air didn't solve the problem, so I desoldered it. I found 3 broken pads under the chip (root cause?): the chip pads remained on the PCB.

(the aluminum foil is to protect the surrounding components during hot air operations)

I ordered a "ProMicro NRF52840" developer board as a donor board

I have successfully removed the chip and soldered on the Chameleon PCB (not an excellent job, but it should work).

Now I need help to flash it with this J-Link device: I mean both hardware connection and software procedure.

Thanks in advance