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.

[endnode]

Oh so you can see some USB device on the host! Isn't it just wrong driver selection? Have you tried some "virgin" Windows machine with just SEGGER J-Link SW package installed?

[GC]

The board enumerates in USB as sam-ba bootloader when blank. I'm able to reflash bin file like nRF5x-OB-JLink-IF with sam-ba tools (not with drag and drop interface). But once reflashed it's does'nt enumerate.

[GC]

I just tried to plugg it on a blank windows (10) with segger driver and still seen as a bossa device.

[MartinBL]

Hi. We have seen a few occurrences of this lately and we are trying to figure out what it is and how to solve it. We had one guy successfully fixing a similar issue by following the steps at this blog: https://wiki.newae.com/Manual_SAM3U_Firmware_Update

[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!