Better him than someone than the person who started up 5 threads still on the same page with super long topic titles.
But he did try install it on 2 XBOX's, so here's a few tips..
On the 1.0 try the backup BIOS and flash it there.
On the 1.6B try the 2nd 1MB bank for flashing... If none work at all, you need to really check your installation.
Edit: Try either method seperately not one after the other.