Did you use a regular old chinese CH341A in 24 I2C mode to pull the rom? Or did you happen to have a python script handy for pulling 24 I2C roms with the Adafruit FT232H. I'm hesitant to use the chinese option, as those only run at 5v - most eeprom chips need 3.3v.The BIU pin code is stored on the 24A01 eeprom. Location is address 16-17 and 26-27. This is true up until 2006. I have a BIU from 2008 which seems to have a different format.