turdus merula

• The program may get stuck before/after iBSS/iBEC/PongoOS transmission.

  • This may be due to USB connection issues, if you encounter this, start over from the beginning.

• Restoring to iOS 10 may result in your device getting stuck in recovery mode.

  • Until a future update fixes the issue, restore to iOS 10.3.3 first before downgrading to your target version.

• Restoring to iOS 9 from a higher version may result in a restore failure.

  • If you encounter this issue, restore to iOS 10.0 - 10.2.1 first, then downgrade to iOS 9.

• Restoring to a version that is too old using pre-installed blobs may fail.

  • Perform a tethered downgrade first, then retry the untethered downgrade.

• Restoring any device using pre-installed blobs from factory may not restore baseband correctly.

  • Baseband features & activation may not work.

  • Tethered restores may work fine.

• For devices with a baseband chip, if Found non-customer FDR hashes. pops up during a restore, it's almost certain you'll have baseband issues.

  • There is no fix for now.

  • Workarounds might be developed in the future.

• Some A9 devices on iOS 9 cannot be activated. Complain to Apple.

• iOS 10 - 11 may fail to boot when restoring or tether booting, getting stuck on "recfg done".

  • Solution: Force reboot and try again. In case your device panics instead of hanging, report the issue.

• The latest baseband firmware for iPhone 7 Global (iPhone9,1 and iPhone9,2) & iPad Pro (A10X) Cellular is not compatible with iOS 10.

Q: What is turdus merula?
A: turdus merula is a tool that allows you to downgrade your iOS/iPadOS device to any version you want, tethered or untethered (A valid SHSH blob is required for untethered downgrades).

Q: What is a SHSH blob?
A: SHSH blob is a file generated by Apple that signs a specific iOS/iPadOS version. It can only be obtained while Apple is still signing that version. SHSH blob is required for untethered downgrades and are uniquely tied to each device.

Q: What is the difference between tethered and untethered downgrades?
A: A tethered downgrade requires connecting the device to a computer every time it boots, but it does not require a valid SHSH blob. An untethered downgrade functions like a normal system boot without requiring a computer, but it does require a valid SHSH blob.

Q: What devices are supported?
A: Devices with A9 to A10X chips running iOS/iPadOS are supported. Devices with A11 and later chips are not supported. Support for tvOS may be considered in the future.

Q: What iOS/iPadOS versions are supported?
A: All iOS/iPadOS versions that the supported devices have previously run are supported. Note that tethered downgrades may have a more limited range of supported versions.

Q: How does this differ from futurerestore?
A: futurerestore requires a compatible SEP to work, which restricts which iOS/iPadOS versions you can downgrade to. turdus merula does not have this limitation and thus supports all iOS/iPadOS versions.

Q: Will turdus merula ever be open-source?
A: An open-source version of turdus merula is planned for the future, but the current focus is on stability, reliability, and bug fixes.
- LGPL sources are here >> libirecovery libfragmentzip idevicerestore
- Module objects built into idevicerestore are available here >> resource.tar.zst

Q: Where can I find the usage instructions?
A: Here

Q: How should I report a discovered issue?
A: Please report it here: GitHub Bug Tracker

Q: Is there a comprehensive user guide available?
A: The detailed user guide can be accessed here.
>> Untethered Downgrade Guide
>> Tethered Downgrade Guide

Made by

Clarity

kok3shidoll

Mineek

Thanks to

Alfie CG

axi0mX

Cryptic

littlelailo

Nick Chan

Siguza

staturnzz

tihmstar

windknown

xerub

checkra1n team

libimobiledevice