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

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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 transfer and immediately it reboot the display KD986. this does not happen to other cogs regardless of power setting. Battery power drops as well.

i have gotten the bafang cable and SPEEED app to get some reading on the settings as below. Help needed - what could possibly cause this problem and how can i tweak it ?
 

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