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Can confirm, flashing the ecu in service mode works like a charm.

Update: I installed the gen 4 ecu and flashed it in service mode successfully. My 2018 is now showing as "ccs compatible"

I have all the parts I need to install a "gen 4" charge port ecu, but no idea when my next software update might come through. I'm going to try to install and use service mode to flash the ecu this weekend. That's all I really need it for at the moment. Wish me luck!

Does anyone know if I can use this option instead of using the OTA update method for replacing my gen 3 ecu to gen 4 for CCS compatibility?

I'm a little late to the party, but yesterday on my 18 M3 I was able to enter service mode at home using the described method.