Joke Collection Website - Public benefit messages - The firmware of iPhone has been reduced from ios9 to 8.4. 1. Can I keep the original application and data? Just click Update I on iTunes.

The firmware of iPhone has been reduced from ios9 to 8.4. 1. Can I keep the original application and data? Just click Update I on iTunes.

No, to downgrade with iTunes, you must download the system package of 8.4. 1 first, and then resume the update. But the data is gone, just like new. If there is no important software information, just back up the phone book with iCloud. If there is, you should make an honest backup of it immediately.