I cannot tell from the description but it sounds like a Matrix or socketed Homebrew chip.
It does sound like he simply upgraded the Bios for you.
Nice Colors a cool little Matrix Inside logo to drive you nuts.
The CHIP and the BIOS are two different things.
Please understand that.
EvoX will "detect" the Bios for you if you have the correct CRC values entered in the EvoX.ini
for the particular bios you are using. Otherwise it will say "unknown"
This is under Settings and Xbox Info in the EvoX dash.