2. on 6.0 marshmallow
Go to this download link and download https://mega.nz/#!pEEGFLbJ!scUWYUCZ_...4DyCT7jSWCW35E
Then use root explorer and navigate to /system/etc/permissions and place the xml file inside with permissions of rw-r--r-- (0644) once changed, reboot then gyroscope should be enabled.
I dont want or take any credit for this post or guide as I found the details and links on here.
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