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With the opcom, just go to Infotainment -> Programming -> Code Index -> find 009 in the list on the left, the right hand side will confirm Astra H Linear Voltage and hit programme.

Job done.

I'm fairly sure I set the code index on programming, check / set the code index to 009

As you have an aftermarket radio, I set the theft protection without the radio and selected no radio in the variant configuration to give you the settings menu.

I think you said you have opcom, if...