VW Polo 2002 1.2 eprom NO Data

I thought my VW Polo's ECU was failing (car was running properly), so I bought a different computer 2nd hand from a VW Polo.

I removed the immo chip from the 2nd hand one, and replaced it with the original chip from my existing computer.

The car didn't start with this setup.

When I put the original chip back into my original ECU, my car won't start anymore either.

When I read the 93c76 with CarProg (clone) , it reads all zero's.
Verify is ok though.

Is it possible when u unsolder the chip outta the ECU, it will lose it contents? Like some sorta security?

How can I get back the data of the original chip, or how can I put it on a new chip?

This is the ECU i'm talking about, see picture: