There are several method to login with google login, google login can be complicated for some newbies. I do prefer other login but google is the last choices
Method #1 is consider the best option and it will work 99% of time
Requirement:
Rooted device
Patched device
Unsigned mod apk
You can patched your device with
Lucky Patcher (might need several tries to applied on Android 9+ until success, warning might brick your device)
Core Patch
Use both is also an option
Method 1
Install the game from Playstore or original apk from apkcombo
Open the game and login your account
Close the game and install mod over without uninstall the original
Method 2
Install original version of the game. Log-in your Google account as normal
Install Titanium Backup. Go to MENU/Preferences
In Backup setting: tick Always for Backup app external data
In Restore setting: tick Restore app external data
Then back-up the game you want
Uninstall the game and install the mod
Go to Titanium backup and choose the game to restore
Choose Restore APP DATA ONLY
After finishing restore, log-in the mod game and enjoy
Go to "OTHER PERMISSIONS" or "ADVANCED PERMS" and tick "DRAW OVER" or "DISPLAY POP-UP WINDOW"
WHY BLACK/WHITE SCREEN/CRASHED?
Enable STORAGE permission
Remove gameguardian or any similar memory tool
Remove adblocker
Some device has battery optimization, disable it
GAME STILL CRASHED, HOW TO SEND LOGS?
Go to folder /Android/data/game package name/files/mod_menu_crash_logs.txt
Copy & paste or take a screenshot inside the logs, send it here
Some device may have different dir (document files)
Alternative way: Install matlogs app (required root device), open matlogs & click start record. Open the game wait for game crashed or few minutes and stop record.