HT201351: What to do before selling or giving away your iPhone, iPad, or iPod touch
Learn about What to do before selling or giving away your iPhone, iPad, or iPod touch
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Helpful answers
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Sep 22, 2015 5:54 AM in response to eeutoby J-Kuan,This website shows a step by step way to download and install iOS 9. If you have iOS 7 currently and want to jump straight to iOS 9 there is a few steps more you have to do.
There is a bug when updating from iOS 7 to iOS 9 (Skipping iOS 8). Luckily it is easy to fix!
Step 1 - Backup your device (This will save things like photos, text messages, etc).
Step 2 - Download iOS 8.4.1 for your iPhone or iPad.
Step 3 - Reboot phone into DFU mode - hold down the sleep/wake button and home button - when it reboots let go of power button - still hold home button
At this point it will ask you to connect your phone to iTunes - will have to connect phone to the computer.
Step 4 - Hold down the Option (Mac) or Shift (Windows) and and then click restore.
Step 5 - Browse to the 8.4.1 file you downloaded and select it. This should restore to the previous IOS version. Note: This will wipe phone.
Step 6 - Restore from backup. Hope that you backed up before attempting to update.
Step 7 - Download and install iOS 9.
More information can be found at: https://support.apple.com/en-us/HT205239