Signed version - Guest sign in only
Unsigned version - Google log in (Need Root)
How to sign in via Code.
Go in a clean version(better if you have secondary device if not you need to remember the code) with an account signed/linked
1.Top right corner with 3 bars icon
2.Tap account/option
3.Scroll down and you'll see "Data transfer(code)" (you'll see there's an instruction)
4. Copy/remember then confirm
5.Home screen of App when launch(hacked version) , btm left corner choose code sign in