1. Don't use a BFM Bios.
2. X2_5035 is the latest BIOS from TeamXecuter and it works great.
3. No matter which BIOS you choose to use, make sure it's 512K and the right version for your xbox.
4. You cannot use AID to initially flash your chip, but once the chip has been flashed via other means, you can use AID to re-flash the BIOS and install dasboards, apps, emulators, etc. . . .
X2_4981 is a bit older, but works just fine.