Toshiba NB 500 wrong bios flashed

[florin]

Hello! I have a Toshiba NB 500 netbook and I flashed the wrong bios. Now the fan is spinning faster when power on and screen is black.

I tried with WinCrisis and a 4 GB usb stick and another of 32 GB. The problem is it doesn't seem to read usb or I don't enter the correct combination. Only once when I removed everything and insert the usb, kept pressing fn+b+power and introduced the AC the netbook booted and it reset quickly.

And If I have the original bios, can it be disassembled in order to find the right combination?

Thank you!