4 ms·Backup, wipe, and reinstall.by aaronbrethorst 9y agoBackup, wipe, and reinstall.Yizahi 9y agoIn some cases it doesn't help. E.g. iOS 7 update for iPad2, iPhone 4/4S etc.dep_b 9y agoiOS 7 was pretty rough on anything slower than an iPhone 5