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T2 stores part of its firmare on the NAND chips so they need to be working properly for T2 to boot.
It should be possible to swap the NAND chip and then perform a T2 DFU recovery, but I haven't seen anyone confirm it yet. (no donor boards available for these)
Well, I’ll put it aside in case « one day » I have a an exact matching donnour board, I think it should be the same storage size, otherwise some resistors configuration will have to be modified probably like ram strap resistors in older models.