plxpil

Hello all,
what is your experience with all applications needing the magnetic sensors as compass and iron detector on chines copy of smart phones?
on my HERO H2000+, none compass application is working : needle blocked!
With iron detector, the magnetic field stays to zero on the value scale
Yet, applications as smart sensors or android sensor box wich warn when the sensor is absent don't give any message as "your device doesn't have this sensor" (example : thermometer);
Do you think the magnetic sensors are present on my HERO H2000+ (as on all chinese phones of my friends) and in this case why not working and what to do to activate them ?
Thanks a lot for help