This has been sort of a problem already in the Wii U community as some units have a less reliable NAND chip. For that console the community has developed the ability to emulate the NAND chip with an SD card. Proper NAND replacements are possible too but obviously more work and more risk and I think you may have needed to dump your encryption keys beforehand. Potentially it can be fixable but for some consoles like the Xbox Series line that we know very little about it may not be.

This explains all those lots of "untested" WiiU's I see for sale.