That's not a security failure, you have an open bootloader. If you want a secure device, lock it. But even then a knowledgeable thief can still reflash it in EDL, so there's no 100% security ever.
Put the cerberus apk on their website in a flashable .zip and put into the queue when flashing in...
There's national and international roaming. It seems your cell carrier is a virtual one and uses other carrier networks to provide the service (national roaming).
Double press Vol- to open Camera doesn't turn on the screen anymore, but only runs the camera, then I have to press Pow button to turn on the screen and see it's running.
No idea if this is because I have password screenlock + fingerprints set now, or an actual bug. Version: 2016.11.24
So, will Mi5 users who flashed the most beta ROM of them all with Nougat now spam these threads every week ? It's useless, because that feedback isn't eligible for other phones anyway and the ROM is more a work in progress then M or L builds.
Do you mean general phone lock or app lock? I don't understand the issue. Do you otherwise use a phone lock?
You have to think about the fingerprint as only a shortcut for the actual locking mechanism (pattern, pin, password). So you have to set something out of those, then use a fingerprint...
Simple, this forum thread is for a certain topic for discussion and not "All open questions here". There's a place for that in the Q&A subforum (https://xiaomi.eu/community/forums/question-answers.22/).
Irrelevant posts like these just make it harder for people to read about the topic...