Originally Posted by saratoga
That means the flash memory is either blank or burned out. Since you didn't do anything that would have erased it, and were apparently getting random file corruption before, my guess is the flash chip died.
I've tried unbricking method presented on Rockbox site, the recovery one but nothing happened, so i gave up and it looks like I'll have to -unfortunately- say hello to my ipod since i have nothing else left.
So, thanks to everyone that tried to help me, especially WalkGood.