Downgrade iOS: How to Revert to an Older iPhone/iPad Version

Downgrading iOS: Returning to a Previous Version

Apple consistently provides updates for its iPhone and iPad devices to ensure optimal performance and security. However, circumstances may arise where a user prefers to revert to a prior operating system version.

This is particularly relevant for individuals experimenting with beta releases of iOS on their iPhone or iPad. Beta software, while offering early access to new features, can sometimes introduce instability.

Limited Downgrade Window

Typically, after a new stable version of iOS is released, the ability to downgrade to the previous version is restricted to a short timeframe, often just a few days. This is due to Apple’s signing process for software updates.

Fortunately, a workaround exists to potentially bypass this limitation. It's generally more straightforward to revert to the most recent stable iOS build if you've been testing a beta version.

Easier Downgrade from Beta

When participating in the iOS beta program, the process of downgrading is simplified. Apple provides a more accessible pathway to return to the officially released version of the operating system.

This is because beta versions are explicitly intended for testing and feedback, and a clear rollback option is crucial for users who encounter issues or prefer the stability of the final release.

Reverting to a Stable iOS Version

Should you be operating with a beta or preview release of iOS on your iPhone or iPad, the process of reverting is straightforward. However, it's crucial to understand that this action will result in complete data erasure from your device.

Backups generated while running the beta iOS version are incompatible with older iOS versions. Consequently, you will either need to utilize a backup created before the beta installation or configure your device anew following the downgrade.

Restoring via iTunes

To return your device to the officially released, stable version of iOS, a computer running iTunes – either a Mac or a PC – and a suitable cable for connection are required. Begin by powering off your iPhone or iPad. This is achieved by pressing and holding the Sleep/Wake (or Power) button until the power-off slider is displayed, then sliding it to the right.

Connect the cable to your computer, but refrain from connecting it to your iPhone or iPad just yet. Press and maintain pressure on the Home button of your iPhone or iPad. While continuing to hold the Home button, connect the cable to your device. Continue holding the Home button until the "Connect to iTunes" screen is visible; it depicts a cable pointing towards the iTunes icon.

If iTunes doesn't launch automatically, initiate it manually. iTunes will detect an issue with your connected device. Select the "Restore" option, and then confirm by clicking "Restore and Update."

This action will erase all data currently stored on your iPhone or iPad and reinstall the current stable iOS version, replacing the previously installed preview software.

Restoring from a Previous Backup

If a backup was created before the installation of the beta iOS version, you can restore it after iTunes completes the operating system restoration. Simply select "Restore Backup" from the device management screen within iTunes.

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Restoring iOS with an IPSW File

Apple’s ecosystem mandates the use of digitally "signed" firmware images, representing specific iOS versions, for device updates and restores. Typically, Apple ceases signing older iOS versions shortly after a new release becomes available.

Consequently, a downgrade to a previously installed iOS version is often feasible for a limited time following an upgrade – provided the latest version was recently launched and the upgrade occurred promptly.

This process necessitates an .ipsw file. These files might be locally stored if iTunes was utilized for prior updates, but are often automatically removed to conserve disk space. Obtaining the IPSW file from a resource such as IPSW.me is frequently required. Crucially, only iOS images designated as signed can be used for restoration; unsigned versions are incompatible.

After downloading the appropriate file, establish a connection between your iPhone or iPad and your computer, then launch iTunes. Navigate to the device’s summary page within iTunes.

On macOS, simultaneously press and hold the Option key while selecting the "Restore iPhone" or "Restore iPad" button. For Windows PCs, hold down the Shift key and then click the corresponding "Restore iPhone" or "Restore iPad" button. A file selection window will appear; locate and double-click the downloaded .ipsw file to initiate the restoration to the chosen iOS version.

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Preserving SHSH Blobs for Future iOS Restoration

Currently, there are only two officially supported methods for reverting to earlier iOS versions. These involve either stepping back from a beta release to a stable one, or downgrading to the immediately preceding stable version within the limited timeframe Apple provides signing support.

However, when Apple digitally signs an iOS version, it's possible to utilize a tool to record this "authorization" for running that specific iOS version. This is achieved through the creation of "SHSH blob" files.

These files are unique to each device and act as digital signatures, dictating which iOS versions are permitted to operate on that particular device. By obtaining these files, users can retain the ability to restore to that older iOS version at a later time.

Consider a scenario where you're running an older iOS version with a desirable jailbreak, but wish to test the latest release. Securing a local backup of your SHSH blobs before upgrading is crucial.

This allows for a subsequent downgrade to the previously unsigned version, enabling continued use of your jailbroken applications and customizations.

TinyUmbrella, among other potential tools, can be employed to generate these local SHSH blob backups. Subsequently, it can be used to override iTunes and initiate restoration from older IPSW files.

Apple generally discourages users from running outdated iOS versions on their devices. While Apple may occasionally permit downgrading in response to significant issues with a new release, this is not a standard practice.

Users have the option to delay updating their iPhones and iPads, as these devices will not automatically force upgrades. However, once an upgrade is performed, reverting to a previous version is typically not possible.

Image Credit: Olle Eriksson on Flickr