For the people who can't login their Houkai 3rd via Facebook:
1st.) If you have a mihoyo account bound then use that.(if you did not bound your account through mihoyo then move to step 2.
2nd.)Go to sdcard -> Android -> data and change the houkai files or add 1 go to Android -> obb and change...
For some reason if I clicked the Facebook login, its just stuck there and after awhile the game would stop responding.(the Facebook popup doesn't show and I even deleted the Facebook app)