I want to mention that during the setup steps there is a label showing phone image and the new update image; well, at phone image I get blank space -> as if it doesn't have anything on it.
I also read about goldcards and I don't know if I should try that.
I remember that once it showed in bootloader PD29100 and now it shows
SCHU100 SS-BC (4k)
SD SANDISK 15193MB Class0
Thank you very much!