On-Board programmer erased, How to reflash it? What to reflash?

[GC]

On a NRF52DK Board, There is an on-board programmer done with ATSAM3U2C seen as a Segger programmer or a Jlink Progammer.

By mistake, I erased the entire flash of this programmer. I know it's possible to change its firmware with the IF BOOT/RESEST Boutton. But i think I erased the bootloader that allow that.

I'm trying to reflash it through Sam-ba bootloader of Atmel but I can't find a firmware that boot correctly. I tried this firmware and this one

But It doesn't seem to boot.

[GC]

Hi Rishi,

When I plug the board on a windows, it's seen as a Bossa Com Port. On a linux, it's shown as a AT91_Sam-BA_Bootloader (the Lowlevel bootloader from Atmel for their chip). I don't have the directory opening and the blinking led when I plugg the board with "IF BOOT/RESET" pushed unlike Gaute Gamnes's procedure.

I think I erased the code responsible of that... and i can't find it.

[GC]

Hi Martin, Thanks for the info, I tried to flash the firmware from the blog (Whisperer Board) into the ATSAM3U of the NRF52 board. and It boots. Unfortunatly, it boots as a Whisperer board and not as an OB-Jlink or Segger probe. I still don't have the window opening when I plugg the board. so I can't upload regular firmware (from Nordic) to fix it. I think I'll have to buy another NRF52DK. or a real JTAG probe.

Thanks for the help guys!