Post Bad Gps Health

Hello people.
I have a Crius V1/Hobbyking board and Cn-06 gps (i presume it’s ublox), flashed with Apm plane 2.74b R4 beta reporting “bad gps health” no matter what. I have strong gps lock with low hdop, and no problem whatsoever with gps. Same board flashed with apm copter reports no gps problem.
As a result, Guided mode can’t be activated, it triggers RTL, i presume because of bad gps health issue.

Any suggestion welcomed. Thanks in advance.