hướng dẫn downgrade ios

Downgrading iOS can be a bit complex, and it’s essential to note that Apple doesn’t officially support downgrading to earlier iOS versions once a new version is released. However, there are certain scenarios where you might want to downgrade, such as encountering issues with the latest iOS release or for jailbreaking purposes.

Please be aware that the information provided here might become outdated as Apple frequently updates its software and policies. As of my last knowledge update in January 2022, here is a general guide on how you might attempt to downgrade iOS. Keep in mind that these steps may not work for the latest iOS versions, and you should check for updated information based on your specific situation.

Requirements:

1. iTunes or Finder: Make sure you have the latest version of iTunes on Windows or Finder on macOS.
2. Downloaded IPSW file: You’ll need the IPSW file for the iOS version you want to downgrade to. You can find IPSW files on websites that host iOS firmware, such as ipsw.me.

Steps:

1. Backup your device: Before attempting any downgrade, it’s crucial to back up your data using iCloud or iTunes/Finder.
2. Download the IPSW file:

• Go to ipsw.me or another reliable source to download the IPSW file for the iOS version you want to downgrade to.

1. Turn off Find My iPhone/iPad:

• On your device, go to Settings > [your name] > Find My > Find My iPhone (or Find My iPad), and turn it off.

1. Connect your device to your computer:

• Use a USB cable to connect your iPhone or iPad to your computer.

1. Open iTunes or Finder:

• Launch iTunes on Windows or Finder on macOS.

1. Enter Recovery Mode:

• The steps to enter recovery mode vary depending on your device model. Here is a general guide:
  • iPhone 8 or later: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the recovery mode screen.
  • iPhone 7 or 7 Plus: Press and hold both the Side and Volume Down buttons simultaneously until you see the recovery mode screen.
  • iPhone 6s or earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons simultaneously until you see the recovery mode screen.

1. Restore using IPSW file:

• In iTunes or Finder, you should see a message saying that your device is in recovery mode and needs to be restored. Hold down the Shift key (Windows) or Option key (Mac) and click on the “Restore iPhone” or “Restore iPad” button.
• Choose the IPSW file you downloaded earlier.

1. Wait for the process to complete:

• iTunes or Finder will restore your device to the selected iOS version. This may take some time.

1. Set up your device:

• Once the restore is complete, follow the on-screen instructions to set up your device. You can choose to set it up as a new device or restore from your backup.

Keep in mind that Apple might stop signing older iOS versions, making it impossible to downgrade. Additionally, downgrading can lead to data loss, and not all features may work correctly on older iOS versions. Always exercise caution and check for the latest information before attempting to downgrade.