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Guide for the poor souls who updated to 1.0.3
>Backup your data first
>write down your backup ID and key
>uninstall the app
>grab the 1.0.2 apk from apkmirror
>install the apk
>choose "Data transfer" when prompted
>enter the backup ID and key from earlier
>your save will be restored with everything intact
>congratulations you successfully downgraded your game!