1. Delete the game data and cache from your device's settings.
2. Uninstall the game.
3. If you have the facebook app uninstall it too, for some reason the facebook login on mods only works through web browser.
4. Restart your device (I'm not 100% sure this is mandatory, but I did it just to be sure)
5. Log in to your facebook account on your web browser.
6. Download and install the game version 5.2.2, it's on page 519 of the forum.
7. Run the game, when it prompts you to update it select later (some people have an issue where the game doesn't give them the option to update later, this is why you have to delete the game's data and cache first).
8. When you're on the character creation screen link your facebook account to the game, it will open it through the web browser and then you can retrieve your save. Bear in mind that if your character is wearing any type of clothing implemented after 5.2.2 it will return an error and you won't be able to log in using this method, you would need use the playstore app, log in to that one, change your character's clothing and then do these steps.
9. Exit the game and update to the latest version without uninstalling version 5.2.2
That should do it.
Edit: Oh I forgot, after you complete all the steps and retrieve your save file you can reinstall the facebook app if you want to.