If you want to downgrade your iOS device with FutureRestore, there are multiple components that need to be present and work fine before the downgrade process can succeed. At first, you would need to have your SHSH2 blobs saved prior to the iOS version getting unsigned, you need FutureRestore, and most importantly, SEP and Baseband need to be compatible from the latest version or a signed iOS version to the one you try to downgrade to.

How does SEP and Baseband compatibility work?

When you use FutureRestore to downgrade your iOS version, you combine components from two different IPSW files containing two separate iOS versions. Let’s say you wanna downgrade to iOS 14.3 from iOS 14.6. Assuming a kernel exploit exists that can enable you to set the Nonce Generator from inside the saved SHSH2 blobs, you will need to combine the following:

Let’s say iOS 14.7.1 is the latest version, and iOS 14.7 is signed. I will be able to combine iOS 14.3 (the version I try to downgrade to) with either iOS 14.7 or iOS 14.7.1.

The reason we need to combine them is that we need a signed SEP and Baseband from a current version, and here’s where things can get tricky because the latest signed version may not always have a SEP and a Baseband compatible with the version you try to downgrade to.

In our example, the SEP and Baseband of iOS 14.7 are compatible with iOS 14.3 so the restore would proceed, but if you wanted to downgrade to iOS 13.7, the SEP and Baseband wouldn’t have been compatible so the restore would have failed.

• How do I downgrade with FutureRestore? Here’s a full FutureRestore iOS Downgrade guide!
• Here you can find the latest iOS Jailbreak downloads and check if there’s a jailbreak available for you.

How do I know if SEP and Baseband are compatible?

You need to research whether the SEP and Baseband of the current signed versions are compatible with the version you try to downgrade to before attempting to downgrade. Otherwise, the downgrade can fail and brick your device which will require you to update to the latest iOS version which may not be jailbreakable for months.

Below you can find our chart of compatible SEP and Baseband for FutureRestore downgrades!

What is Cryptex1 on Apple devices?

Starting with iOS 16.0, Apple introduced a new firmware component known as Cryptex1 which is a “virtual” co-processor. The whole purpose of this component is to aid Apple in pushing Rapid Security Responses which are different compared to the normal updates you receive.

The Rapid Security Responses can be installed much faster and are always security fixes and patches, never cosmetic bug fixes. This component, like all the rest inside the IPSW, has a signing ticket.

The problem is that it’s a very rare occurrence for a newer Cryptex1 component to be compatible with an older version of iOS outside the minor versions (e.g. 16.3 vs 16.3.1) because it contains the dyld shared cache among other libs, so trying to restore this component will always fail during the downgrades.

Since Cryptex1’s signing ticket doesn’t use ApImg4Tickets or APNonces, saving the ticket for it is not doable for now, which means A12+ downgrading is pretty much dead until this is figured out.

SEP and Baseband Compatibility Chart

IMPORTANT:

• You can check out the current signed iOS versions for your device, including the Betas, on our iOS TSS Signing Status Page!
• If the list below shows you can do a downgrade, you can find the right SEP and Baseband files for your downgrade using the SEP Finder Bot by @nyuszika7h. Check below first!

Last Updated: July 2023

SEP and Baseband Compatibility (CTRL + F and search for your model):

iOS 16.5.1

• iPhone SE 3rd Generation – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone SE 2020 – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone 11 / 11 Pro / 11 Pro Max – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone XS / XR / XS Max – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone X – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone 8 / 8 Plus – Downgrades to 16.5 might be possible. Anything lower will very likely FAIL because of Cryptex or SEP incompatibility!
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.6 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.6 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.6 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.6 without issues. Downgrades to iOS 13.7 and lower will fail.

The data below this line doesn’t apply anymore because these versions are no longer signed. Data is left here for reference purposes only!

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Historic Data:

iOS 16.3.1

• iPhone SE 3rd Generation – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone SE 2020 – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone 11 / 11 Pro / 11 Pro Max – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone XS / XR / XS Max – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone X – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone 8 / 8 Plus – Downgrades to 16.3 might be possible with dev-branch of FutureRestore. Anything lower will FAIL because of Cryptex or SEP incompatibility!
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.2 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.2 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.2 without issues. Downgrades to iOS 13.7 and lower will fail.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.7.2 without issues. Downgrades to iOS 13.7 and lower will fail.

iOS 15.6

• iPhone SE 3rd Generation – Downgrades to iOS 15.4 – 15.5 might be possible with the latest SEP.
• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – There’s no iOS 14 for these devices, so no downgrades. iOS 15.0 – 15.3.1 will also likely fail. Downgrading to 15.4-15.5 MIGHT be OK.
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – Incompatible. Downgrades from 14.1 – 15.3.1 with iOS 15.6 SEP + BB will likely fail and bootloop the device. Downgrading to 15.4-15.5 MIGHT be OK.
• iPhone SE 2020 – SEP & Baseband are compatible.
• iPhone 11 / 11 Pro / 11 Pro Max – Incompatible. Downgrades from 14.1 – 15.3.1 with iOS 15.6 SEP + BB will likely fail and bootloop the device.
• iPhone XS / XR / XS Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x – 15.3.1 with them will break FaceID. Downgrading to 15.4-15.5 is OK.
• iPhone X – SEP & Baseband are technically compatible, but restoring to iOS 14.x – 15.3.1 with them will break FaceID. Restoring to 15.4-15.5 is OK.
• iPhone 8 / 8 Plus – SEP & Baseband can be used to restore iOS 14.3 – iOS 15.5 without issues.
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.5 without issues.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.5 without issues.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.5 without issues.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.5 without issues

iOS 15.4 – 15.5

• iPhone SE 3rd Generation – Downgrades not applicable.
• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – There’s no iOS 14 for these devices, so no downgrades. iOS 15.0 – 15.3.1 will also likely fail.
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – Incompatible. Downgrades from 14.1 – 15.3.1 with iOS 15.4 SEP + BB will likely fail and bootloop the device.
• iPhone SE 2020 – SEP & Baseband are compatible.
• iPhone 11 / 11 Pro / 11 Pro Max – Incompatible. Downgrades from 14.1 – 15.3.1 with iOS 15.4 SEP + BB will likely fail and bootloop the device.
• iPhone XS / XR / XS Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x – 15.3.1 with them will break FaceID.
• iPhone X – SEP & Baseband are technically compatible, but restoring to iOS 14.x – 15.3.1 with them will break FaceID.
• iPhone 8 / 8 Plus – SEP & Baseband can be used to restore iOS 14.3 – iOS 15.4 without issues.
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.4 without issues.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.4 without issues.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.4 without issues.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 15.4 without issues

iOS 15.3.1 / 15.3

• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – There’s no iOS 14 for these devices, so no downgrades. iOS 15.x to 15.0 downgrades should work for now, but no Nonce Setter.
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates which is fixable only if you update to iOS 15.
• iPhone SE 2020 – SEP & Baseband are compatible.
• iPhone 11 / 11 Pro / 11 Pro Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates which is fixable only if you update to iOS 15.
• iPhone XS / XR / XS Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates which is fixable only if you update to iOS 15.
• iPhone X – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates which is fixable only if you update to iOS 15.
• iPhone 8 / 8 Plus – SEP & Baseband can be used to restore iOS 14.3 – iOS 14.8 without issues.
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues

iOS 15.1 

• iPhone 13 / 13 Pro / 13 Pro Max / 13 mini – There’s no iOS 14 for these devices, so no downgrades. iOS 15.x to 15.0 downgrades should work for now, but no Nonce Setter.
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates.
• iPhone SE 2020 – SEP & Baseband are compatible.
• iPhone 11 / 11 Pro / 11 Pro Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates.
• iPhone XS / XR / XS Max – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates.
• iPhone X – SEP & Baseband are technically compatible, but restoring to iOS 14.x with them will break FaceID, ROOT FS Snapshots, and OTA Updates.
• iPhone 8 / 8 Plus – SEP & Baseband can be used to restore iOS 14.3 – iOS 14.8 without issues.
• iPhone 7 / 7 Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPhone 6S / 6S Plus – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPhone SE – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues.
• iPod Touch 7th Generation – SEP & Baseband can be used to restore iOS 14.0 – iOS 14.8 without issues

IMPORTANT: You cannot use the SEP and Baseband from iOS 14.8.x OTAs for FutureRestore Downgrades.

iOS 14.0 -> 14.8 range (This data is outdated, for references only. Please check the data above the line for the current status)

WARNING:  There may be issues with A12-A14 FutureRestore on versions older than v225 which are not SEP / BB compatibility related. Please use FutureRestore v225 (beta) or NEWER as it fixes the issues.

• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between). Multiple reports of FDR errors on A14 when using older FutureRestores like 222. Always use the latest beta version.
• iPhone SE 2020 – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPhone 11 / 11 Pro / 11 Pro Max – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPhone XS / XR / XS Max – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPhone X – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.3 (and everything in between). iOS 14.0 -> 14.2 may fail.
• iPhone 8 / 8 Plus – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.3 (and everything in between). iOS 14.0 -> 14.2 may fail.
• iPhone 7 / 7 Plus – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPhone 6S / 6S Plus – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPhone SE – SEP & Baseband Compatible from iOS 14.8 down to iOS 14.0 (and everything in between).
• iPod Touch 7th Generation – SEP is Compatible from iOS 14.8 down to iOS 14.0 (and everything in between). This device has no Baseband.

iOS 13.4 -> iOS 13.7 range:

• iPhone SE 2020 (iOS 13.4.1 and up) – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone 12 / 12 Pro / 12 Pro Max / 12 mini – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone SE 2020 – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone 11 / 11 Pro / 11 Pro Max – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone XS / XR / XS Max – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone X – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone 8 / 8 Plus – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone 7 / 7 Plus – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone 6S / 6S Plus – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPhone SE – SEP is compatible but Baseband is not compatible. Downgrade will fail.
• iPod Touch 7th Generation – SEP is compatible. Downgrade will fail.

iOS 13.0 -> iOS 13.3.1 range

• iPhone 11 / 11 Pro / 11 Pro Max – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone XS / XR / XS Max – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone X – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 8 / 8 Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 7 / 7 Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 6S / 6S Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone SE – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPod Touch 7th Generation – SEP is not compatible. There’s no baseband. Downgrade will 100% fail.

iOS 12.0 -> iOS 12.5.4 range

• iPhone XS / XR / XS Max – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone X – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 8 / 8 Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 7 / 7 Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 6S / 6S Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone SE – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPod Touch 7th Generation – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 6 / 6 Plus – SEP & Baseband Compatible from iOS 12.5.4 down to iOS 12.0 (and everything in between).
• iPhone 5S – SEP & Baseband Compatible from iOS 12.5.4 down to iOS 12.0 (and everything in between).
• iPod Touch 6th Generation – SEP is Compatible from iOS 12.5.4 down to iOS 12.0 (and everything in between). This device has no Baseband.

iOS 11.3 -> 11.4.1 range

• iPhone 6 / 6 Plus – SEP & Baseband Compatible from iOS 12.5.4 down to iOS 11.3 (and everything in between).
• iPhone 5S – SEP & Baseband Compatible from iOS 12.5.4 down to iOS 11.3 (and everything in between).
• iPod Touch 6th Generation – SEP is Compatible from iOS 12.5.4 down to iOS 11.3 (and everything in between). This device has no Baseband.

iOS 11.0 -> 11.2.6 range

• iPhone 6 / 6 Plus – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPhone 5S – Neither SEP nor Baseband are compatible. Downgrade will 100% fail.
• iPod Touch 6th Generation – SEP is not compatible. There’s no baseband. Downgrade will 100% fail.