Programming nrf51-DK with another nrf51-DK

[RohanKadam]

I have two nrf51-DK's (say A and B).

A , nrfStudio doesn't detects it.
(Windows doesn't even shows USB port connection in device manager, so cannot try nrfjprog --recover)

B is working fine.

I was trying to reach A's flash using B's J-link SWDIO/CLK connection pins, so that I can some how reset bootloader section and recover my board A.

A is still inaccessible. So it seems I am doing something wrong. Please help me to Unbrick my nrf51-DK (A).

Any suggestions will be very much helpful.

[Jørgen Holmefjord]

Have you tried putting the board into bootloader mode, by holding IF BOOT/RESET button while powering the board? If it shows up as a removable drive with name BOOTLOADER, try drag and drop program the J-Link OB interface firmware.

[RohanKadam]

After dropping the program in BOOTLOADER drive. LD5 started blinking very fast. On power cycling my board, everything started working properly.

Thanks a lot.