Following iOS 15.6 release Apple now stops signing iOS 15.5. This prevents devices from downgrading to previous iOS releases.
Reference: Apple Stops Signing iOS 15.5 Following iOS 15.6 Release, Downgrading No Longer Possible
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:
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