How to Downgrade iOS 11 to iOS 9.3.5: A Comprehensive Guide

Downgrading from iOS 11 to iOS 9.3.5 can be quite challenging, especially since Apple stopped signing older versions of iOS shortly after releasing new ones. This article will guide you through the potential methods, risks, and considerations of downgrading your device to iOS 9.3.5.

Understanding Signing Status

Apple only allows the installation of iOS versions that are currently signed. Since iOS 9.3.5 is no longer signed, you typically cannot downgrade to it through standard methods. This article explores possible methods with their limitations.

Possible Methods with Limitations

Check for SHSH Blobs

SHSH blobs are small files that contain the signing information for iOS builds. If you previously saved SHSH blobs for iOS 9.3.5 using tools like TinyUmbrella or Cydia, you might be able to use them to downgrade. To use these SHSH blobs, you would need a tool like RedSn0w or 3uTools to help with the signing process. These tools facilitate the installation of iOS builds that are no longer signed by Apple.

Using Third-Party Tools

Some third-party tools claim to facilitate downgrading but these can be risky and may void your warranty or damage your device. Use these tools at your own risk. Be cautious when using third-party tools, as they may not be as reliable or secure as official methods.

Jailbreaking Your Device

Jailbreaking your device might allow you to install older iOS versions. However, this process can be complicated and may also void your warranty. It may also expose your device to security vulnerabilities. While jailbreaking can provide flexibility, it is a significant step that should not be taken lightly.

Conclusion

If you haven’t saved SHSH blobs for iOS 9.3.5 before Apple stopped signing it, your options for downgrading are extremely limited. The safest approach is to stay on the latest version of iOS for security and compatibility reasons.

If you are experiencing issues with iOS 11, consider troubleshooting those issues or seeking alternatives that don't involve downgrading.

While there are ways to potentially downgrade to iOS 9.3.5, the process is fraught with risks and limitations. If you are not a tech-savvy user or do not have the necessary tools and backups, it is strongly recommended to stay on the latest version of iOS.

Note: This article is provided for informational purposes only. The author assumes no responsibility for any damage or issues that may arise from attempting the methods described herein.

For more detailed instructions, consider consulting official documentation or reputable tech communities.