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.

[Rishi]

Hey JC, From what I have understood, I think you are unable to program the device. I would recommend performing following procedure:

1. Check if the device is listed in Device Manager. If yes, does it have an exclamatory symbol?

2. When you plug your device into the system, does a directory open which includes SEGGER.html, MBED.html, USER GUIDE.html and README.txt. Also, if the directory does not open on its own, check if a new drive has appeared in your system.

3. Follow Gaute Gamnes's procedure mentioned here

[endnode]

If you erase auxiliary Atmel chip completely there won't be any USB device visible, that looks logical to me. I would be also worried that neither SEGGER nor Nordic release FW image including bootloader but I might be wrong.

[Rishi]

I had this issue a while ago. As I recall, segger.html file did not exist anymore. So following the Gaute's procedure, you need to drag and drop the segger.html file. Download from www.segger.com/.../jlink

[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?