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The following page summarizes various considerations for downgrading to 4.2. For specific instructions for your deployment type, see:
Once upgraded to 4.4, if you need to downgrade, we recommend downgrading to the latest patch release of 4.2.
Downgrade Floor
If you need to downgrade form version 4.4, downgrade to 4.2.6 or a later version. You cannot downgrade to 4.2.5 or an earlier version.
Optional but Recommended. Create a backup of your database.
Before downgrading the binaries, you must downgrade the featureCompatibilityVersion (fCV) to "4.2".
Before downgrading the binaries, remove all persisted 4.4 features that are incompatible with 4.2.