1991 audi 80 can't find way to remove engine ecu?

Even if its present day, they have secure bolts fitted, grinder is your best bet as they're torque snap bolts, so the heads are of course gone, I'd cut a square or rectangular head then you can use a spanner or grips to undo.

Done 2 tt's recently which I had to do the same for cruise.
 
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