I had the same issue and I was able to restore and get back to my old version.
As mentioned inI followed everything, but still I cant flash my device correctly.HTML:
Here are my details.
I tried to flash ARHD 6.5.3 XE
PYRAMID PVT SHIP S-OFF RL
Jun 2 2011, 22:31:39
HBOOT 1.17 is gingerbread. ARHD 6.5. is ICS. You need to flash the newest base firmware (3.32) if you're going to use that rom. It will update your HBOOT to 1.27