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.