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I followed the instructions and it murdered my head unit. The display slowly fizzled out and now it doesn't work. All I did was add the patch and reassemble it. Completely dead. So I grabbed someone's old head unit from ebay to try again assuming maybe it was just faulty in the first place. Nope. It murdered that one too. I literally only followed the instructions.
Just go get one installed by car toys or something. Not worth it.