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ooh boy ooh boy, good (de)soldering is really NOT my thing especially PCB's.
But with some jumper cables I finally cracked the code ;)


The LCD screen works, so for everybody trying this be aware of I2C address 0x27 or you need to hack/replace the firmware which nobody tried (mentioned) as far as I know.

Maybe I'll start a new topic "replacing the micro controller board" when I'm up to a new adventure.