You must have flashed the Beta firmware.hi i have build number U9-H 7.1 FW001 20180814. is this the most up to date one? Android version shows as 7.1.2
The latest official stable firmware is FW008 Android 6.0.1
https://theminixforum.com/index.php?threads/neo-u9-h-008fw-final-marshmallow-os-firmware.43/post-69
Call that stable... you minix guys have balls...