无法刷4850BIOS

ATIFLASH
========
Error list and troubleshooting guide.

0FL01?Error programming ROM
----------------------------
- Check that the command line arguments you passed are correct.
- Check that the BIOS image file specified exists and isn't corrupted.
- Check that the ROM isn't write protected.
- If a parameter in the BIOS image file differs from a parameter in the
  current ROM image (e.g. SSID), and you're sure you want to program
  the image, specify the -f (force) flag on the command line.

0FL02?Error accessing ROM
--------------------------
- Check that the command line arguments you passed are correct.
- Check that the ROM connections on the board are secure.

0FL03?Error in checksum
------------------------
For a BIOS image file:
- Check that the checksum you specified on the command line is correct.
- Check if your BIOS file has been corrupted.

For the board BIOS:
- Check that the checksum you specified on the command line is correct.
- Try programming the BIOS again.

For the board ROM:
- Check that the checksum you specified on the command line is correct.
- Check that the size you specified on the command line is correct.
- Verify that the extra non-BIOS contents of the ROM are correct.
- Try programming the BIOS again.

0FL04?Error verifying ROM
--------------------------
- Check that the command line arguments you passed are correct.
- Check that the BIOS image file specified exists and isn't corrupted.
- Check that the BIOS programmed into the ROM is the same as the one
  specified on the command line.
- Try reprogramming the ROM with the BIOS image.

0FL05?Error modifying SSID / BIOS
---------------------------
- If using -mi check that the command line arguments you passed are correct.
- If using -mb check that the contents of file you passed are correct.
- Test the rom access (atiflash -t ).
- Check that the ROM isn't write protected.
- Check that the BIOS programmed into the ROM isn't corrupted.
- Try reprogramming the ROM, then modifying the SSID again.

无法刷4850的BIOS，DOS下刷的，出现了以上的错误，求强人解答