Logically, this makes a lot of sense – you took an update and now you are corrupt, therefore the update caused the corruption, right?
But Build 880 did not cause corruption, it exposed the corruption that you already had.
Downgrading to an old build won’t help – All of your backups will still be corrupt, you’ll never be able to take an update, and eventually you will get this screen and be in exactly the same position you are today.
Build 880 seeks to solve this problem by detecting database integrity issues “on the fly” – that way you don’t make corrupt backups and have one you can restore if need be.