In usual manner following iOS 16.2 release Apple now stops signing iOS 16.1.2 preventing downgrade.

Reference: Apple Stops Signing iOS 16.1.2 Following iOS 16.2 Launch

Recommendations

Developer:

Keep devices from upgrading if previous iOS release is needed.

QA engineer:

Keep devices from upgrading if previous iOS release is needed.

PM/DM:

Business as usual.

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