TinyUmbrella is an iOS downgrade tool that can save SHSH blobs (Apple's signature protocol for iOS restores and updates), and use the blobs to create a pre-signed IPSW firmware file that can downgrade iPhone/iPad to an older iOS version even if Apple has stopped signing the version.
If you are waiting for an iOS 11 jailbreak and don’t want to miss out the rare opportunity to jailbreak your device, then now is your chance. An iOS 11.1.2 Jailbreak may be releasing soon and it will not work with iOS 11.2. So to maximize the chances of your iPhone, iPad or iPod touch supporting the jailbreak, it should be running iOS 11.1.2. Luckily Apple has not closed the iOS 11.1.2 signing window.
This essentially means you can upgrade to iOS 11.1.2 if you are running any iOS version released before it. You can also downgrade iOS 11.2 to iOS 11.1.2 until the signing window is opened. In this step by step tutorial we will guide you on how to install or downgrade iOS 11.1.2 on your iPhone, iPad or iPod touch and prepare for the possible jailbreak release.
Update:iOS 11.1.2 Is No Longer Being Signed
Upgrade or Downgrade to iOS 11.1.2
Note: Before you begin, do make sure iOS 11.1.2 is being signed. We will update this post once the signing window closes, after which you won’t be able to install it.
But, if a version of iOS is signed by Apple, you can use a tool to capture that “authorization” to run the previous version of iOS — in the form of “SHSH blob” files. These are device-specific digital signature files that control which versions of iOS can run on a device. Many iOS 11 users have emailed us asking how to downgrade from iOS 12/11 without a computer, so we specially make this section to collect some ways to remove iOS 12/11 without PC or Mac. But unfortunately, by far, there are not some ways we can find to delete iOS 12/11 without a computer, so to downgrade from iOS 12/11, please do as the first. But when iOS 12.1 comes out (soon) you will for a few days be able to downgrade from that to iOS 12.0.1. How to downgrade iOS 12 Follow these instructions to downgrade to an older version of iOS.
Step 1: First of all you need to download iOS 11.1.2 IPSW for your device. You can find the link specific for your device here.
Step 2: Once the IPSW file has been downloaded connect iOS device to iTunes and then put your iPhone/iPad in DFU mode.
DFU mode instructions: Press and hold the Sleep/Wake button and Volume Down button (Home Button iPhone 6s or earlier) for 8 seconds. After 8 seconds let go of the sleep button while keeping the Volume Down/Home button pressed. Let go of the button as iTunes says “iTunes has detected an iPhone in recovery mode”. Click on Ok button on computer to continue.
Step 3: Now hold the Option/Alt key (Shift key on Windows) and click on the ‘Restore iPhone/iPad’ button. From the window that opens select the iOS 11.1.2 IPSW file you downloaded earlier.
Step 4: Click on ‘Restore and Update’ button and let iTunes downgrade or upgrade your device to iOS 11.1.2.
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.
Downgrade From Beta to Stable
If 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.
RELATED:How to Reset Your iPhone or iPad, Even if it Won’t Boot
To restore your device to the stable version of iOS, you’ll need a Mac or PC running iTunes and a cable to connect your iPhone or iPad to that computer. Turn off your iPhone or iPad by holding down the Sleep/Wake (Power) button until the Power switch appears and sliding it to the right. Plug the cable into the computer, but not the iPhone or iPad. Press and hold the Home button on your iPhone or iPad — and keep holding it down. Plug the cable into your iPhone or iPad and keep holding the Home button down until the “Connect to iTunes” screen appears. You’ll see a cable pointing at an iTunes icon.
Launch iTunes if it doesn’t automatically appear. iTunes will inform you that there’s a problem with your device. Click the “Restore,” button and then click “Restore and Update.” iTunes will wipe the data stored on your iPhone or iPad and reinstall the current stable version of iOS rather than the preview version of the iOS software is was previously running.
If you have a backup created prior to installing the beta version of iOS, you can click “Restore Backup” from the device’s screen in iTunes to restore it onto the device after iTunes finishes restoring its operating system.
Restore Using an IPSW
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.
Save SHSH Blobs So You Can Restore Later
Those are the only two official ways to downgrade to previous versions of iOS. You can either downgrade from a beta version to a stable version, or downgrade to the previous stable version during a short window where the old IPSW files are still signed by Apple.
But, if a version of iOS is signed by Apple, you can use a tool to capture that “authorization” to run the previous version of iOS — in the form of “SHSH blob” files. These are device-specific digital signature files that control which versions of iOS can run on a device. Once you’ve received that authorization for your device, you can keep those files and restore that old version of iOS at any point.
For example, if you’re using an older version of iOS with a jailbreak available but you want to play with the current version, you’d want to get local copies of those SHSH blobs before upgrading to the current version. This way, you can then downgrade to the older, unsigned version and continue using your jailbroken software.
You can use TinyUmbrella — and possibly other tools — to create local copies of these SHSH blobs. Afterwards, you can use it to force iTunes to restore older IPSW files.
Apple doesn’t really want you running a previous version of iOS on its devices. Apple might occasionally let you downgrade to a previous version of iOS if there’s a big problem with the latest version, but that’s it.
You can choose to sit on the sidelines, if you like — your iPhone and iPad won’t force you to upgrade. But, after you do upgrade, it’s not generally possible to downgrade again.
Image Credit: Olle Eriksson on Flickr
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