Evening all, I’ve recently upgraded from 3×10 to 1×11 using a complete new drivetrain. My problem is with the shifting, I can back pedal on the largest rear sprocket without derailing but going up and down the cassette is where the issue is. I an get it to change up but it won’t go the other way and vice versa . The cable was new at the same time and still seems free as it hasn’t done hardly any mileage. Anyone help please ??

Cheers

B screw adjusted correctly?

Yeah , b screw is fine