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I had the retrofit installed yesterday (confess I am still unaware of the part number of the ECU used in the replacement) without issue. The car will now charge from a CCS fast charger (with the supplied Tesla adapter), although this is not an easy experience. The car will also still happily...
I upgraded my 2020 M3LR from 24.3.20 to 24.3.25 with the CAN cable connected, and the trunk controls continued to function. Unfortunately, error PCS_a022 started appearing after about 30 minutes, after a short sleep.