odysseusOTA 2

Feeling nostalgic? Own an iPad 2 or an iPhone 4s? Then you have the opportunity to travel back down memory lane and downgrade your device from any firmware back to iOS 6.1.3—no SHSH blobs required.

Entitled odysseusOTA, the command line tool takes advantage of the fact that Apple is still signing the OTA (over the air) firmwares for iOS 6.1.3 on the iPad 2 and iPhone 4s. Want to see the downgrade in action? Then watch this detailed step-by-step video.

The downgrade method is the work of developer tihmstar, with additional credit going to winocm (kloader), xerub (odysseus), and iH8sn0w (consulting) among others.

Obviously this downgrade method will have extremely limited use-case scenarios, as it is strictly limited to the  aforementioned firmware/hardware combos. Nonetheless, it is an impressive (no SHSH blobs needed!) feat, when you consider how difficult Apple makes it to downgrade firmware these days.

What do you think? Do you have an old iPhone 4s or iPad 2 laying around? Would you consider trying odysseusOTA?

  • Satish

    Hi, is anyone getting this error

    “ERROR: could not retrieve device serial
    number. Can’t continue.” error?
    iphone 4s ios 8.2 8gb

  • Chris Nova

    does anyone know if this still works? i have BOTH an iphone 4s + ipad 2 and id like to do this to BOTH of them!!!! because they are both really pain in the ass slow compared to how they used to be….. its early 2017? is this procedure still possible or have things changed since 2015 and it no longer works?

  • Winston Hegemur

    Hi, just want to share another method i have tried. I have an Ipad 3 running 9.3.5 and it is killing me because too much lag on the game performance.
    I red about opening ipsw using zip archive file and was wondering if I could find something inside it that could allow me to downgrade my ipad to 8.4.1.
    So I tried to manipulate the ipsw content using WinRAR and turns out I was enable to remove the content of 9.3.5 and replace it with 8.4.1.
    The files that I replace are 3 dmg file and 1 j2a file at front and 1 bbfw file in the Firmware folder. Remember to rename the file from 8.4.1 to match the file name inside 9.3.5 that will be replaced.
    Now I am running IOS 8.4.1 inside IOS build number 9.3.5.

    I also tried the same method with my Iphone 4 but it turns out bad because I am trying to downgrade from 7.1.2 to 6.1.3. Probably there is a major difference in the operating system between this two release. Meanwhile 8.4.1 and 9.3.5 is not much of a difference.

    I still waiting for a downgrade method for my iphone 4 since i forgot to save the shsh.

    Anyway, Hope this method help for your new releases.