If your dd-wrt x86 has crapped!
A:use Damn Small Linux, boot into the Gui. Get internet access, download the latest beta, and then use the command "dd if=dd-wrt_public.image of=/dev/hda" (remove quotations)
A:I not totally sure about the fdisk /mbr. I think I would try to totally erase the mbr. I've seen various flavors of Windows NOT erase a grub mbr even after a full windows install. I had to fdisk the drive from Linux and erase the partition to rid the drive of the MBR. Try downloading a very small bootable Linux ISO, and boot from it, with the drive in question attached as Primary Master. From a shell, type " fdisk /dev/hda". Then type "d", then w to write the changes. "m" will give you a help screen. Then, just type "dd if=ImageFileName of=/dev/hda" All should be fine then. I've not had a 100% success rate using physdiskwrite, and eventually gave up on it. Hope this helps, and good luck.
A:but the damn small linux way will not erase the part3 partition. basicly you need to delete /usr/local/nvram/* then just reboot
A:basicly you must erase the third partition. thats all