I ended up bricking my acer bios when trying to downgrade to a somewhat old version of bios. I had a black screen and nothing was working. I tried to recover through the USB pendriver. I tried flashing the USB with the isflash.bin file. I also changed the file name to BIOS.bin, BIOS.fd, C5V01118.fd, C5V01118.bin, isflash.fd and a few others, but with no success. I opened the bios with UEFItool and located the name as C5V01X64.fd, but it still did not work. I turn on the fn + esc button, the fan turns very fast, but it does not give a signal.