You have to have hardware storage and you have to back up your phone to your computer, then when you do want to downgrade you have to put it in DFU mode, connect to computer and reinstall.
In: Technology
The newer OS version will be updating system config files to new formats and the newer system apps will be updating their data to new formats.
The old OS and app versions can’t read these so you’d need to update the old app version with a new version to support the format that the new version uses and have all these old and new updates in parallel.
It’s all quite a pain so because only a few technicality minded people should be on the beta they just tell you to take a backup.
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