We have a bunch of RB941-2nD (hap lite) routers (8 out of 30 routers) that broke after /system package update install
They just didn't boot up normally after upgrade. It seemed like a bootloop, because switch functions appeared to be working for a second (we tried to ping other devices downlink the router, 1 reply in 5-10 minutes).
We could not connect to diagnose, so just did netinstall and then restored config from binary backup we had from before upgrade.
Just a warning for those, who might want to upgrade a remote router: make a backup and be ready for a ride to netinstall.