Not touched a AEB, but from a quick google, it looks like they are m3.8.3, like the AGU. AFAIK, this means you need to desolder the eeprom to read/write it. Easiest way to beat a m3.8.3 ecu is an immo emulator
http://www.ebay.co.uk/itm/VAG-IMMO-Emulator-VAG-immobiliser-fit-for-VW-Golf-III-Audi-Passat-B4-Lupo-98-/281442330010?pt=LH_DefaultDomain_3&hash=item418745259aIve tested a similar emu on a AGU and it works just fine, plugged it into the diag port and off we went.