I highly recommended that you obtain a Xecuter2 bios (build 4979, 4981 or 4983). If you have no more problems with the flash software, format with option 6 and write the bios image to "bios 6 256k". Set the dips 1=on, 2=off, 3=on, 4=off. If you are not sure how the dips should be set, write the bios to all bios banks. Bios 1 and 2 need 512k bios image, so use Xbtool to modify your bios image size from 256k to 512k.
Those bios builds I mentioned, have two bios versions in the rar archive: 49xx.06 and 49xx.67. If your hard disk is smaller than 137GB, use version .06. Actually, use .06 version always unless you want your 137GB+ hard disk to be compatible with older bioses that don't have LBA48 support.