Following iOS 15.4.1 release Apple now stopped signing iOS 15.4 preventing downgrade on devices.
Reference: Apple Stops Signing iOS 15.4 Following iOS 15.4.1 Release, Downgrading No Longer Possible
Recommendations
Developer:
Avoid updating devices, if iOS 15.4 is needed for development.QA engineer:
Avoid updating devices, if iOS 15.4 is needed for testing.PM/DM:
Business as usual.
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