It's actually beatable. I know that sounds like a lie, but it's true, I know a lot of people won't believe me because I don't have screenshots, but I actually did manage to beat it on my old phone I think 2 years ago (might be wrong), I basically kept the mask on before anyone entered the room and got lucky with BB and the insta-jumpscare glitch, I remember the ending very well too, here's what it was,

after the 6 AM screen, it shows a newspaper saying that the Fredbear's location we were in, burned down to the ground, after the newspaper, it shows a screen saying "the end" with a question mark hidden in the darkness at the bottom left, and if I recall correctly, there is no reward for beating the night, no star, nothing!

I know a lot of people won't believe me, but whatever!

(I tried to beat the game again to get screenshots of the ending but I can't beat it!)