You have to boot bank 1 in the 1.6 and now for the bad bit it can sometimes take 20 or 30 reboots for the flashbios screen to appear if it has flashbios 3.03 on it. Some occasions it will not work at all on a 1.6 and you have to boot the chip in an older box and flash it with a 1.6 bios.
I am assuming you rebuilt the LPC as per the diagrams when you installed the pin header