Posible NAND corrupted == motherboard replacement?

My PSP does not execute anything (homebrew, UMD, downloaded games,...), I tried software repair (Pandora batteries with "Despertar del Cementerio", etc.) but in the end nothing improves, it still does not run anything (eternal PSP loading screen).

Everything worked fine till it froze during gameplay (I was messing around with some plugins at the time).

Dumping the NAND showed bad sectors.

(Maybe too much bad sectors?)

TLDR;

So...If I try to replace the motherboard should I fix any NAND problem, right?

btw, which firmware will it start with after motherboard replacement?