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Help Misconfigured magnetic field sensor

Compass / orientation is weird, getting the azimuth wrong most of the time. After a bit of investigation with a sensor app, I concluded that the reported Z component of the magnetic field is opposite what it should be. Is there a simple way to just flip the reported magnetic field in just one axis? I'm pretty sure with that correction, compass and other orientation features should work correctly. Alcatel One Touch Evolve 2, not rooted.
 

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