Apple now prevents downgrade from iOS 15 and iPadOS 15. This means that during restore operation, device will receive iOS 15 or iPadOS 15 accordingly. This seemingly would improve iOS adoption rate.
Having no other iOS 14.x update, any previous version will now be only updated to iOS 15 too.
This needs to be taken into consideration for test devices.
Reference: Apple stops signing iOS 14.8 for some devices, blocking downgrades from iOS 15 [U]
Developer:Business as usual.
QA engineer:Keep existing iOS 14 and iPadOS 14 from updating, if needed.
PM/DM:Keep pool of test devices, ensure that automatic updates are not enabled.
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