Flasher un bios a150

Windows
Just download the file from here. Select FreeDOS and the drive letter of the USB drive, just like in the screenshot, and click OK.

2 Extract all files from the BIOS zip file onto the USB drive.

3 Reboot and press F12 to select a bootable device.

4 Choose option 5 when prompted by FreeDOS and ignore the error about a missing CD-ROM. Change to drive C: by typing C: and if that doesn't work try drive B: instead. If it then still doesn't work, or if FreeDOS doesn't even boot to a prompt, try a different USB drive as the AA1 can be a bit picky.

5 Run the batch file to flash the BIOS by simply entering its filename, which is 3310.BAT for the latest BIOS version. The process usually takes only a few seconds. The AC adapter must be connected or the flash utility will wait until it is.

6 After successfully flashing the BIOS the AA1 will reboot by itself. A few BIOS settings will be reset to default values and might need to be readjusted if they were altered before.

http://macles.blogspot.com/2008/07/flashing-bios.html