skoro nie jesteś "taki zły" to w paczce z romem, jaki Ci polecałem jest manual a w nim jak byk pisze:
Start your device in bootloader mode by pressing and holding down:
DPad + PowerButton + ResetButton
After a second release ResetButton, then release the rest of them.
Your screen will show word "Serial" at the top.
You are in bootloader mode now.