Results 1 to 2 of 2
Discuss downgrading to os 4 at the iPhone 3GS -; just wondering if it is possible to revert back to ios 4 from ios 5. ...
  1. #1
    Newbie Array Ish!t's Avatar

    Join Date
    Mar 2013
    Post Thanks / Like
    Rep Power

    Default downgrading to os 4

    just wondering if it is possible to revert back to ios 4 from ios 5. If possible then how?

  2. #2
    Super Moderator Array n1ckn4m3's Avatar

    Join Date
    Mar 2009
    Post Thanks / Like
    Rep Power


    Depends on the phone. If you have an old-bootrom 3GS or a 3G, it's fairly trivial to do. On the new bootrom iPhone 3GS or newer you need an SHSH for the target revision of iOS, and if you've already upgraded to iOS 6, it's extremely difficult and requires both an iOS 5.x SHSH and an iOS 4.x SHSH.

    Short answer, if you don't know what an SHSH is check the link in my signature and check your Cydia in hopes that it cached some. If you have no SHSH and are on a new bootrom iPhone 3GS or newer, there is absolutely no way to downgrade the phone. To stave off the inevitable questions:

    1) No one else's SHSH will work for your phone, unfortunately.
    2) You can't get an SHSH for the version of iOS that you want it for unless Apple is currently signing it. You can check the iPhone Wiki to see what versions are currently being signed.
    3) I wasn't kidding when I said that there is no way around this that is known yet for devices newer than the old-bootrom iPhone 3GS. As there is no bootrom exploit, there is no way to bypass the SHSH requirement. Since iOS 5.0+ includes the random apticket nonce as well as other protections, it is much more difficult to downgrade once you have upgraded to iOS 5 or newer.

    I saw in another post you mentioned you had a 3GS. If that is the phone you're trying to downgrade, find out whether it is a new bootrom or old bootrom. Old bootroms are easy to downgrade since there is a low level hack, new bootrom phones are much more difficult and can brick more easily.

    I know you asked about going down to iOS 4 from iOS 5, but the instructions below should suffice for a new bootrom 3GS, just replace the ipsw files and SHSH files with your respective version.

    If you have an old bootrom device, it's a lot easier. Download redsn0w or sn0wbreeze and make a custom firmware for the target revision, put the phone into DFU or pwned DFU mode (can't remember which you'd need, it will say in the app) and restore.
    Last edited by n1ckn4m3; 03-01-2013 at 05:02 PM.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

    iPhone 4, 32GB (iOS 6.1.2 | evasi0n | SHSH: 4.0 - 6.1.2)
    iPad 2 3G, 64GB (iOS 6.1.2 | evasi0n
    SHSH: 4.3 & 4.3.3 - 6.1)

    Restore problems? Read this:

    Did we solve your problem? Got a dollar or two spare? Please Donate!



Similar Threads

  1. Need help downgrading from 6.15.00
    By gmabry75 in forum Redsn0w
    Replies: 1
    Last Post: 10-10-2012, 12:27 AM
  2. Downgrading From 3.0 to 2.2.1
    By iNikolas in forum PwnageTool
    Replies: 1
    Last Post: 06-30-2009, 08:38 AM
  3. Downgrading..
    By copl in forum iPhone "2G" (Rev. 1)
    Replies: 0
    Last Post: 11-24-2007, 10:42 AM
  4. downgrading to 1.1.1 need help!!!!!
    By lion3000 in forum Free Toolchain Software (Cydia App's)
    Replies: 4
    Last Post: 11-18-2007, 04:51 PM
  5. Downgrading from 1.02 to 1.01 - possible?
    By yahrun in forum General
    Replies: 1
    Last Post: 09-20-2007, 11:00 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Powered by vBulletin®
Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.
Search Engine Friendly URLs by vBSEO
(c) 2006-2012
All times are GMT +2. The time now is 03:04 AM.
twitter, follow us!