Correct me if I'm wrong, but I looked for those errors in code and they originated from a piece of code used for Samsung's OneNAND, which is flash memory.

AFAIK there's OMAP's 512MiB internal/embedded flash, and the 16/64GB "external". Is that what you meant?

I've read that worn out flash cells could be revitalized by heating them. You can try putting your device in the oven (kidding here ofc. But flash-heating is a valid way to fix it.)