A few months ago, we’ve published an article about a new iOS downgrade tool called OdysseusOTA which allows users to downgrade their iPhone and iPad back to iOS 6.1.3 and no SHSH blobs needed. The only downside of this downgrade utility is it lack of supportive devices and firmware.
To addressed this limitation issues, the developer has released a newer version called OdysseusOTA 2.0, which add support for iPhone 5, iPhone 5c, iPhone 4s, iPad 2 and iPad 3.
iOS 6.1.3 isn’t the only firmware that you can downgrade back to, OdysseusOTA 2 also added support for iOS 9.0 – 9.0.2. In other words, if you have upgraded your device to iOS 9 and isn’t happy with what the update has to offer, then now you can downgrade from iOS 9.0.2 to iOS 8.4.1.
If any users are interested in doing so, please take this opportunity because this method require a jailbroken device as well as SHSH files. To me surprise, Apple still hasn’t closed the signing windows for iOS 8.4.1 yet and so this is a great chance for anyone looking for a new downgrade tool for iOS.
This works because apple still signs 8.4.1 OTAblobs for these devices and we have keys for them. This method does not work on any other iOS version.
A jailbreak is required for downgrading.
Although there isn’t anything good on iOS 8.4.1 even a jailbreak isn’t available yet, but someone has already released the source code on Github, though. The stability of this firmware might be the key point to some users and they may take this route if a stable device is preferred rather than new broken update (kind of) and Cydia (optional).
Unlike TinyUmbrella, OdysseusOTA 2 or its previous version is not a one-click downgrade tool. Instead, it’s a command line software and will be difficult for beginners to follow.
tihmstar, the developer of OdysseusOTA also published a video on YouTube showing users how to use his tool. We recommend that you take a good look at it, at least once.
odysseusOTA2-v1.0.1.zip SHA1: f20bfa356b244a76fbbc7ba69950c453e1a1c1a4
(adding bundle for iPhone5,4)