you dont really need magisk, just root and backup manager.
On a rooted phone install the app from play store and login to your account as normal.
Use a backup app such as Swift Backup and Backup Data.
Uninstall and install Mod Menu version.
Restore the backup data only open app, and you should stay login.
Thanks @freedcx . Tried and tested. Works fine.
Detailed steps for anyone who needs.
- Use a rooted phone
- Install swift backup
- Install survivor.io from playstore
- Play and move to level 2-3 at least. Close and open game to sync.
- Use swift backup "DATA"
- Uninstall playstore version
- Install @mIsmanXP mod apk . DO NOT RUN.
- Open swift backup and restore "DATA" . Do not restore ext data
- Run survivor io. ( I had to close and reopen to get all progress ) .