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

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.

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