iOS 10.2.1 Downgrade – How to Check If SHSH2 Blobs Are Valid

I've decided to make this video because there were a lot of methods to save SHSH2 blobs lately and some of them unfortunately are not compatible with Prometheus (FutureRestore) Downgrade so they can't be used to go back from iOS 10.2.1 to iOS 10.2. Ever @tihmstar has created prometheus downgrade tool, a lot of SHSH2 tickets saving tools were created: TicketBox, TSS Saver, a SHSH2 Bot for Telegram, TSSChecker, etc. Unfortunately, some of the blobs were saved in a wrong format: i.e. Missing ROSI Tag, missing generator, bad format, incomplete digests, etc. So in this video I will show you how to verify the blobs you have saved to ensure you can use them to downgrade in the future. Some of the blobs were saved correctly but because people used a bad boardconfig, they won't work with their specific device, in the video I show how to check that as well.

You should repeat this procedure every time you save your blobs for a version, and yes, you should save your iOS SHSH2 blobs for any version that appears, you never know when you need to go back to a specific firmware like iOS 10.2.1 or iOS 10.3 Beta.
I have plenty of tutorials on saving SHSH2 correctly, I will attach some down here.

TSS Saver (and checker):
How to save iOS 10.2.1 Blobs:
Downgrade from iOS 10.3 Beta to iOS 10.2:
Untethered iOS 9.3.5 Jailbreak:


About GeoSn0w

C#, C, Objective-C Programmer | Beginner iOS Security Researcher | Content Creator | Web Developer I like to bring the latest news from the iOS / iDevice / Jailbreak battlefield to you in a beautiful manner :) I hope you like the site. If you do, don't forget to check out my channel :)

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