How to Restore iPhone Firmware

Apple wants to keep your iPhone and iPad up-to-date. But you may want to go back to an older operating system. This is especially true if you’re trying out a beta version of iOS on your iPhone or iPad.

When a new stable version of iOS comes out, it’s usually only possible to downgrade back to the old version for a few days, although there’s a trick you can use. It’s easier to downgrade to the current stable version if you’re trying out a beta version of iOS.

you’re using a beta, or preview, release of iOS on your phone or tablet, downgrading is easy. This process will erase everything on your iPhone or iPad, however. Device backups created using the beta version of iOS won’t restore to the old version of iOS, so you’ll need to either restore an old backup or set things up from scratch afterwards.

Apple only allows you to load “signed” firmware images, or versions of iOS, onto its devices. Apple generally stops signing the previous version of iOS a few days after a new version is released.

This means that it’s often possible to downgrade back to your previous version of iOS for a few days after you upgrade — assuming the latest version was just released and you upgraded to it quickly.

To do this, you’ll need an .ipsw file. These may be stored on your computer if you used iTunes to upgrade to them, but they’re regularly deleted to free up space. You’ll probably need to download the IPSW file from a website like IPSW.me. Remember: You can only restore iOS images marked as signed. If the version of iOS you want to restore is marked as unsigned, you just can’t restore it.

Once it’s downloaded, connect your iPhone or iPad to your computer and open iTunes. Click over to the device’s page in iTunes.

On a Mac, hold down the Option key and click the “Restore iPhone” or “Restore iPad” button. On a Windows PC, hold down the Shift key and click the “Restore iPhone” or “Restore iPad” button. You’ll see a file browser dialog — browse to the downloaded .ipsw file and double-click it to restore that specific version of iOS to your device.

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