iOS 8.4.1 Battery Drain, And Other Problems? You Can No Longer Downgrade To iOS 8.4 Users of Apple devices who have upgraded to iOS 8.4.1 can no longer downgrade to the previous version, iOS 8.4, as Apple has closed the window on downgrades, and users having iOS 8.4.1 problems will have to wait until iOS 9 is released next month. by James Geddes