RSS Cant boot Sysnand

[GBATEMP]

The technician installed a Picofly chip and Atmosphere/UltraNX on my Nintendo Switch V2. Everything worked fine, but only two days later I noticed that I can't boot into full stock — neither through reboot, nor through more configs, nor by removing the SD card. I see the Nintendo logo and then a black screen. If I enable logging, I see the following before booting:

Initializing... Atmosphere 1.10.2-70007035 via PKG3 Max HOS: 21.2.0 Unpacking... Done! Found pksi <>. Unknown pksi...
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