Safe Downgrade from iOS 9.2.1 to iOS 8.4: A Comprehensive Guide

Downgrading from iOS 9.2.1 to iOS 8.4 while retaining your data can be challenging, especially since Apple typically stops signing older iOS versions shortly after a new release. As of August 2023, this guide will walk you through the steps to safely perform the downgrade. Please note that the success may vary based on your device and Apple's signing status.

Steps to Downgrade iOS 9.2.1 to iOS 8.4

1. Check Signing Status

First, check if iOS 8.4 is still being signed by Apple. You can use websites verify the signing status of different iOS versions for your device.

2. Backup Your Data

Backup with iTunes

Before attempting any downgrade, back up your device using iTunes or iCloud. This is crucial in case something goes wrong during the process.

Connect your device to your computer.

Open iTunes or Finder on macOS Catalina and later.

Select your device and choose “Back Up Now.”

Backup with iCloud

Open the Settings app on your iOS device.

Tap your name in the top right.

Scroll down and tap on “iCloud”.

Under “Storage Backup,” tap “Back Up Now.”

3. Download the iOS 8.4 IPSW File

If iOS 8.4 is still signed, download the correct IPSW file for your specific device model from a trusted a reliable website for IPSW files.

4. Put Your Device in DFU Mode

To enter DFU (Device Firmware Update) mode, follow these steps:

Connect your device to your computer and open iTunes/Finder.

Press and hold the Power button and the Home button together for about 10 seconds.

Release the Power button while continuing to hold the Home button until iTunes/Finder detects a device in recovery mode.

5. Restore to iOS 8.4

Using iTunes/Finder

In iTunes/Finder, hold down the Shift key (Windows) or Option key (macOS) and click on the “Restore iPhone” button.

Select the iOS 8.4 IPSW file you downloaded.

Follow the prompts to restore your device.

6. Restore Your Backup

Restoring with iTunes

After the downgrade is complete, you can restore your backup from iTunes or iCloud.

Connect your device and select it in iTunes/Finder.

Choose “Restore Backup.”

Select the most recent backup and click “Restore.”

Important Notes

Data Loss Risk

While this method aims to preserve your data, there's always a risk of data loss during downgrades. Ensure you have a complete backup before proceeding.

App Compatibility

Some apps may not function correctly after downgrading, as they may depend on features from newer iOS versions.

Apple Signing

If iOS 8.4 is no longer signed by Apple, you cannot downgrade using this method.

If downgrading proves too complex or risky, consider reaching out to Apple Support or visiting an Apple Store for assistance.