Perinn i have the some problem on my mio p550B after a upload rom, maybe the proble is differences between p550b and p550, what is your model ?, before update i make a backup of rom, i have files: part00.raw, part01.raw, part02.raw and part03.raw. I dont know how to convert this files in a nb0. i think the soluciton for us is to convert. please try to help us. thanks.