How to solve AsRock 1394 GUID error

This is step how to repair Asrock common problem, which is GUID error .

Please refer to below steps to re-write motherboard's 1394 ID.

Find motherboard's 1394 ID on FLOPPY1 connector (1394 ID is 16 digits number. Ex: 00138F0000000091).
Unzip attachment zip file to a bootable Floppy diskette.
After entering pure DOS environment, key in fwguid c xxxxxxxxxx(xxxx means 1394 ID), press ENTER.
After updating 1394 ID successfully, it will show Write GUID function call OK¨.
Reboot your system.

you can see the code under pci slot, like picture below