Inside amd raid option rom I have found this string -lh5- and when I decompress with zip it gives me correct raid1.bin file. However when I compress with lha.exe -a0 it gives me header $2b long the original header is $22 and the amd raid option rom cannot uncompress the file i.e when I inserted the new amd raid rom into bios it doesn't work and it gives me an operating system not found error. I have also removed some bytes from the new header to no avail. The new archive is valid and I can uncompress it with zip for example. Thanks for your help!