Same here, hum noise with pasive pickups, dimarzio evos N and B (with cooper shield), dimarzio crunch lab, dimarzio d activator X, and others seymoud duncans. All pasive pickups have noise hum.
EMG 81, 85, 60, 60A, 89 without hum.
My helix LT has upgrade fw 2.80 -> 2.82 -> 2.90 -> 2.91 ->2.92 all new fw versions have HUM
previous version 2.70: not have hum
GROUND - LIFT XLR button is not working too
obviously have correct ground from power cord and tested.
with others pedals (hd500x, zoom g5 or direct to amp) not have hum in passive pickups with same power cord.