Apple stops signing iOS 14.7 preventing downgrade from 14.7.1. Apple typically stops signing older released from time to time. iOS 14.7.1 contains significant security fixes.
Reference: Apple Stops Signing iOS 14.7 Following iOS 14.7.1 Release
Recommendations
Developer:
Keep 14.7 devices from updates, if needed.QA engineer:
Keep 14.7 devices from updates, if needed.PM/DM:
Business as usual.