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    Bafang M400 / G330 Error 21 when on the largest cog 42T

    Just bought a 2nd hand ebike Ejoysport with a Bafang M400 or G330 match to 36TChainring and a SRAM NX11s 11-42T cassette. When riding uphill, when i shift to the largest cog 42T, regardless which power level setting (1/2/3/4/5) i get error 21 followed by motor jerk or inconsistency power...
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