I'm running Win 7 Pro 64 on a P8P67-regular, Rev 3.1. It came installed with Bios 1502. I've tried installing the latest update. With AI Suite II, all three servers returned a message like "unsuitable image file" or "rom image not matched." I downloaded the file onto a FAT32 USB stick and did not rename the file. I tried AI Suite again with the same result. I then tried the EZ Flash Utility, which returned "image integrity check failed."
Some people obviously have 1503 installed, so what might be going on?