Thank you everyone!

I'll try to flash the main firmware.

In this case the blinking screen is not due to a wrong firmware because I've never flashed it before... A morning, when I tried to turn the phone on it suddenly started to blink. I'm not sure but, the day before I turned it off and when I plugged it in order to recharge the battery, I think there was an unusual wiht blink.

anyway, I'll try to flash the main firmware.