Two Step authentication on an Android ROM

Is it possible to create an android rom where you have to put in two passcodes or passwords or variations thereupon? What I want to do is have my rom require something similar to lg's knock code and a passcode for extra security. Thanks!! :)


Note: I haven't actually done anything yet, just an idea. Still need to learn how to make an android rom...lol

LG G4 Bricked, authentication error, stuck in download mode not sure what to do!

ok so i just got my device about a week ago my phones on sprint and i thought i'd root it finally. I tried to root my device but i couldn't figure out if i was LS991ZV4, zv5, zv6 because i was on the latest firmware (i believe) but i have no clue what those 3 things mean sadly. It's been years since i tried to root a device and thought i could handle it. But i guess i can't.

Can someone tell me what i SHOULD be on currently if my phone was 100% up to date on sprint? And can someone please link me to a site that has the stock image for my device? i've been searching for over an hour now and the only file i can find is a TOT file which i BELIEVE is for ZV4 and if i am in fact on ZV6 than that means i can't restore it back to that image file. I'm in a serious bind here if i've permanently bricked my device.

Multiple factor authentication?

Has anyone heard anything regarding possibly having two or three factor authentication on the 6P?

Ex. Require 2 of the 3 options for authentication
Fingerprint
Pin
Trusted devices

For further example, phone will only unlock with fingerprint if you have a trusted device in range. Or require a pin after fingerprint authenticating if there's no trusted device available.

Seems like it would be a great way to add security to a phone, any idea if this is possible in marshmallow?

Sent from my Nexus 6