Sad, neither of those works on Android. Pressing the power button activates the emergency call screen with a countdown to call emergency services, and power + volume either just takes a screenshot or enables vibrations/haptics depending on which volume button you press.
replyDid you check your phone settings? Mine has an option to add it to the power menu, so you get to it by whichever method you use to do that (which itself is sad that phones are starting to differ in what the power key does).
replyOn Pixel phones, Power + Volume Up retrieves a menu where you can select "Lockdown".
replyNot on my Pixel phone, that just sets it to vibrate instead of ring. Holding down the power button retrieves a menu where you can select "Lockdown".
replyOn my 9 you get a setting to choose if holding Power gets you the power menu or activates the assistant (I think it defaulted to assistant? I have it set to the power menu because I don't really ever use the assistant.)
replyYes, that was the default for me, but I changed it in settings.
replyOh wow, just going into the "should I shutdown" menu also goes into pre-boot lock state? I didn't know that.
replyIt doesn't reenter a BFU state, but it requires a passcode for the next unlock.
replyIt's close enough, because (most of) the encryption keys are wiped from memory every time the device is locked, and this action makes the secure enclave require PIN authentication to release them again.
reply> It's close enough
replyNot really, because tools like Cellbrite are more limited with BFU, hence the manual informing LEO to keep (locked) devices charged, amd the countermeasures being iOS forcefully rebooting devices that have been locked for too long.
There is a way now to force BFU from a phone that is turned on, I can't remember the sequence
replyIt’s called restarting the phone.
replyEh? BFU ("before first unlock") is, by definition, the state that a phone is in when it is turned on. There's no need to "force" it.
replyIf you mean forcing an iOS device out of BFU, that's impossible. The device's storage is encrypted using a key derived from the user's passcode. That key is only available once the user has unlocked the device once, using their passcode.