With iCloud

1. Connect your device to a Wi-Fi network.
2. Go to Settings > [your name], and tap iCloud.
3. Tap iCloud Backup.
4. Tap Back Up Now. Stay connected to your Wi-Fi network until the process ends. Under Back Up Now, the date and time of your last backup is shown. If you get an alert that you don't have enough iCloud storage space to complete the backup, follow the onscreen steps to buy more iCloud storage.

With Mac/PC

• How to back up your device with your Mac
• Back up your device in iTunes on PC

Use the Lightning to USB-C cable (for iPhone and iPad) or the USB-C to USB-C cable (for iPad Pro and iPad Air) included in the box to connect your device to a computer or Mac.

In case you don't have the included cable in the box, you can use third-party cables that support the MFi (Made for iPhone/iPad) certification.

Temporarily turn off Find My iPhone by:

1. Open the Settings app.
2. Tap your name > Find My.
3. Tap Find My [Device], then tap to turn it off.
4. Enter your Apple ID password.
5. Tap Turn Off.

Find My will automatically turn back on after you have successfully installed the IPSW file and logged into your account on the device.

If you're using a Mac, iTunes has been integrated into Finder since macOS 10.15.1.

For Windows users, you can download and install iTunes from the Apple support page

In iTunes/Finder, hold down the Shift key (or the Options key on a Mac) + click on the "Check for Update" button. iTunes will then display a window for you to choose the .ipsw file you downloaded earlier. Navigate to the location where the .ipsw file is saved and click OK.

If iTunes doesn't show your device, try unplugging and plugging in the cable again. If you see the Trust prompt, remember to select Trust This Computer.

After the IPSW file installation process is complete, you will need to restore data from your iCloud or iTunes backup.

Follow the on-screen steps on your device to initiate the data restoration process.