If you think that the 1008's FW may be more up to date than feel free to download the DOS-Flash-Tool and flash the 1008 FW on your 1004!
This works fine to me! After flashing it to the 1008 you can use the normal WINDOWS-Flash to do further updates.
be aware that you can damage your drive if you try to burn at 8x-Speed!!! But If you only use 4x you should probably have nor problems!
Look here for the DOS-Flash-Tool and even RPC1-FW