I think only one person has coded this on a G20 via someone who knows what they are doing. It'll be advanced coding not a prebuilt menu in Bimmercode.
Why don't you just buy the software from connected drive? Probably the easier and warranty safe option. Your car comes with all the hardware by the sounds of it.
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Current: 2020 M340i
Past: M140i, Z4 35is
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