Nexus 6P android 8.1.0. won't boot into safe mode

Phone fully functional (apart main microphone and fingerprint sensor which are unresponsive (even option to add a trusted fingerprint in settings disappeared)), but won't load into safe mode. Even after hard reset it still shows "No command" instead of rebooting into safe mode. Phone Nexus 6P, android 8.1.0. stock.
P.S. Also there's some weird system update which stays there after installing it like I haven't install it