Beheme,
BMS are beta testing a new, EWG specific board. Once beta test phase is over, BMS will probably release an EWG specific JB4 which should include a simplier wiring harness. Might be worth asking the question to BMS about when will a dedicated EWG JB$ & harness be on sale.
PD
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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