Hi, I had the same problem but managed to fix it a lot simpler than anticipated. My car is a 1.6 VW golf.
I started by making some ‘keys’ out of an old debit card to be able to unlock the radio / cassette fixture and pull it out of the main body. I then unplugged the antenna and the three cables to the left at the back of the radio box. Each cable had 3 subsequent cables leading into each main cable. All I did was u plug everything, and then plug in one at a time again, trying the cassette function at each plug in. After everything was back in place, the cassette player began to read the converter I had originally intended to use and everything worked fine. Hope this helps :)
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