I had Rockbox on my gigabeat with dualboot mode. After some time of working fine it crushed. Device gives an error 5 in yelow triangle. I tried to restore the original firmware, however an error occure during sending data. Win xp recognises device as an MTP player. Bestpatcher doesnt work as well. Tried to send an nk.bin file from original firmware using beastpatcher by command prompt. Nothing work. How can I do some kind of Hard reset or sth like that??