Apple no longer allows downgrade to iOS 15.0. Now devices could only be restored to iOS 15.0.1 release. Previously, Apple stopped signing iOS 14 releases.
Reference: Apple Stops Signing iOS 15.0 Following iOS 15.0.1 Release, Downgrading No Longer Possible
Recommendations
Developer:
Keep devices from upgrading, if needed.QA engineer:
Keep devices from upgrading, if needed.PM/DM:
Business as usual.
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