FECs are encoded in the 0BDRRRUU format, where:
B - brand. 2 = Audi, 3 = Bentley, 6 = Porsche, 7 = Seat, 8 = Skoda, 9 = Volkswagen, C = MAN
D - device type. 1 = MIB1 HIGH (Harman), 3 = MIB2 HIGH (Harman), 4 = MIB STD2 (TechniSat / Preh / Delphi), 5 = MIB HS (Delphi)
RRR - region. 000 = Europe, 100 = USA and Canada (NAR - North America Region), 200 = China, 400 = Middle East (AGCC - Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, UAE), 401 = AGCC + Turkey, 402 = AGCC + Israel, 500 = South Africa, 600 = Australia and New Zealand, 700 = India, 800 = Argentina, Brazil and Mexico, 801 = Chile, 900 = Asia / Pacific, D00 = Rest Of the World
UU is the release number. As mentioned above, if all of the "Installed FECs" have releases numbers less than the matching ones in "Supported FECs" - maps are not accepted.
For example: in order to get Skoda Amundsen (MIB STD2) to accept European maps, in the "Installed FECs" list, there must be a FEC code 08400003, where the last digits 03 indicates the maximum release number of map updates that can be used on your MIB.