Audi epprom is diffrent , vin in one place - i changed pin , immo id , immo code and vin and cluster works In a car just out of the box , the only thing i had  to do is add keys. But that was a swap into a immo3 car.

In immo2 car  just changed vin in the cluster after normal adaptation and adding keys.

change the visible one ad let go , have a beer  

I had a look at a vw 920 epprom - I see only one place with vin and immoID

if you want to make a comparison AUDI/VW i attached two dump here: http://nefariousmotorsports.com/forum/index.php?topic=11610.msg97115#msg97115

Where is the encrypted area? Could write your cluster part no.

Okay so I figured I may as well finalise this thread and detail what I ended up doing. So firstly I cannot confirm whether there is in fact encrypted instances of the VIN/IMMO ID/SKC so as mccxxx said I decided to just change what I could see and forget about it.

I changed the three instances of the IMMO ID (these come one after the other in readable format if you have an editor that shows both ascii and hex).
I changed the three instances of the SKC (these come one after the other, straight after the IMMO ID, however they are byte swapped - if the hex shows 0A 15 then in the EEPROM it is written as 15 0A)
I changed the one instance of the VIN (this comes straight after the SKC)

Anyway after checking with VAGCOM the extra field of the 17 - Instruments menu shows the original IMMO ID and VIN of my car. Also the original SKC of my car works successfully as the login to 17 - Instruments.

Hope this may help someone else in need,
James

Just to stir the pot. 

Why not take a "used cluster" with different immo data.

-Read the stock eeprom from it.
-Put it in your car and adapt it with VCDS.
-Read out the new altered/adapted eeprom.
-open both eeproms in a hex editor and see what areas were changed.

The you will be able to determine is there are indeed more changes/encrypted areas then meets the eye.

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