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ECU will definitely have to be removed. Even true for 19-20 after any software update. The last software version that allowed OBD tuning was 07/19. Subsequent software updates require another bench unlock every time.
I gave up with my 19 330iX, sold the BM3 and bought a Turbo Transformer piggyback. When I sold the 330 and got the X5, the TT went straight on.
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