Back up your device before beginning the downgrade process
This downgrade process will wipe your device clean so it can be restored to the version of iOS you originally downloaded. Make sure your device has a recent backup before completing the downgrading process. If you don’t have a backup, you might be able to restore your device by using iTunes.
iTunes 12.4 with all paid apps and games removed (except for purchased game) for a clean install of ios 10.2 .
Download the iOS 11.1.2 firmware file for your device
Note 1: If you have an iPhone 7 or iPhone 7 Plus, download the correct ios 11.1.2 firmware file for your iOS device as shown in the example below.
Note 2: If you have an iPad Air, iPad mini 4, or iPod touch 6th generation, download the correct iOS 11.1.2 firmware file for your device as shown in the example below.
Note 3: Downloading the incorrect firmware file could cause your iOS device to become unusable and/or bricked.”
In this article we’ll teach you how to get your favorite iOS device up-to-date with the latest firmware without paying Apple $99 a pop.
To help you get started we’ve gathered all known public iOS firmware files for your favorite devices and put them in this article.
Connect your device to your computer and open iTunes
Note 2: If you have a device that won’t update using iTunes, then try connecting your device to your computer with a USB cable. Put your device into recovery mode and iTunes should prompt you to restore your device. If that doesn’t work, try connecting your device to a different computer with iTunes.
Note 1: iOS 12 removes the ability to downgrade a device to older versions of iOS. You can’t do this anymore.
Note 0: This article was updated on January 19, 2019 from the original version posted on December 27, 2018. The article was updated to add more information about the discovery of a vulnerability and to offer a workaround.
iTunes is an application that can back up, sync and restore applications, settings, data, music (including apps), and videos to/from iOS devices. It’s also used for buying media in iTunes Store, such as movies and TV shows.
iOS is an operating system designed by Apple Inc. , the company that the iPhone’s hardware is produced by. It came with the first iPhone and has been part of every iPhone ever since. The iOS 12 update is the second major update to the operating system, following iOS 11.
Hold down the Option key on your keyboard and click the Check for Update button in iTunes
Note 3: If you are using an older version of iTunes, click the Restore iPhone button instead. If you are using iTunes 12.9 or older, click the Restore iPhone button in the Summary tab on the lower left side of iTunes. If you are using iTunes 12.8, click the Summary tab on the lower left side of iTunes, click Restore iPhone in the Summary tab, and then connect your iPhone. If you are using iTunes 12.7, choose Check for Update on the Help menu.
How to downgrade to ios 11.1.2
Hold down the Option key on your keyboard and click the Check for Update button in iTunes.
If you’re asked to enter your passcode, enter it and click OK. Your iPhone will be updated to iOS 11.1.2, then you can restore from iCloud or iTunes backup. If you don’t have a backup, skip to Step 4 below. Otherwise:
Select the iOS 11.1.2 firmware file you downloaded in step 2
Note 4: Update to iOS 11.1.2 using the IPSW file you downloaded in Step 2 only if your device is on the latest version of iOS 11 and not on a previous version of iOS. If your device is running an older version of iOS and you are trying to downgrade to iOS 11.1.2, then you need to download an IPSW file for your device instead.
Note 3: If your device is already on iOS 11.1.2, then you should use a different tool to downgrade, such as the iTunes and iFaith method.
Note 2: If your device is on an older version of iOS than iOS 11.1.2, such as iOS 11.0 or iOS 10, then it is not possible for you to upgrade to iOS 11.1.2 via IPSW file using this tool. For this you will need iTunes and iFaith.