I did this on my CLS55 and had the AMG start-up screen.
You try this at your own risk!! No guaranties it will work on your model/COMAND and be aware you can brick your expensive COMAND ....
It could be either of the following, no way of knowing which will work for your combo. For me it was the first one ....
STEP1: Turn ignition to position 2 (NOT turning engine on)
STEP2: Turn on your COMAND unit and select CD.
STEP3: Press "5" button.
STEP4: While holding "5" down, press "3" and "7" down and hold all three buttons down for about 10 seconds until next screen shows up.
STEP5: At the new screen scroll down to select "AMG211_USA"
Step 6: Press "Back" soft key to get out of programming screen
Step 7: Turn car off and wait about 3 to 5 minutes for COMAND to "reset" itself
Step 8: Turn on COMAND unit and you should see AMG logo screen
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Turn ignition key to position 1 or 2.
2. Turn on Comand.
3. Turn to Radio.
4. Press 5 (continue holding and wait 1 second).
5. Press 3 (continue to hold along with 5 key and wait 1 second).
6. Press 7 (continue to hold along with 5 and 3 keys and wait about 3 seconds).
7. A menu should appear. Scroll down and select "AMG219_ECE" option.
8. Switch off ignition, remove key and leave about 5 minutes before turning on again
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