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Mar 19

os3Apple’s iPhone OS 3.0 Beta pre-installation advisory document states that once you’ve updated a device it will be in a locked state with no way of going back to an earlier firmware. Well Ralf Rottmann has tried after restoring Beta 3.0 to downgrade his 2G iPhone back to 2.0.
Check out after the break how he did it.

I’ve been able to do the following:

* Restore (not update!) to Beta 3.0
* Downgrade by restoring back to 2.0 via iTunes
* Jailbreak and unlock by using QuickPwn to custom 2.0 built
* Update (not restore) to Beta 3.0

This particular device is now running perfectly on the Beta 3.0 release with unlock working fine Cydia and Installer are obviously gone, as it has always been the case when applying updates.

To avoid confusion: I’m not aware of any solution, yet, that allows to jailbreak/unlock an iPhone running the current beta of OS 3.0. I did the following: I restored a first generation (not the 3G!) iPhone to the default Apple Firmware 2.0. I then used QuickPwn on a Mac to jailbreak and unlock. This gives me an unlocked iPhone 2G with Firmware 2.0. I then updated to the regular 3.0 Beta via iTunes.

The unlock is preserved, so the update seems to not wipe the modifications done on the 2.0 version. Effectively I’ve now got an unlocked iPhone 2G running OS 3.0 Beta. Cydia and Installer are gone (always happens during updates) but jailbroken apps still run!

Via

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20 Comments

  • At 2009.03.19 10:07, Ralf said:

    Thanks for copy-adding my blog post.

    As of now 50+ comments have been added to the source of this article. You might find those helpful, too.

    Find it here:
    http://www.24100.net/2009/03/downgrading-iphone-os-30/

    • At 2009.03.19 18:54, frame said:

      “Cydia and Installer are gone (always happens during updates) but jailbroken apps still run!”
      how can it be?
      you still have everything you installed on step 3?
      please reply quickly..

      • At 2009.03.21 18:02, luke said:

        Hi Guys, I have juste purchase the standard development package at 99$. If any one want me to add him up, I can do it for 10$ each.
        my email is lukas.gisbert@yahoo.co.uk

        PS: The OS 3 Rocks!!!!!

        • At 2009.03.23 09:14, badge said:

          HI i have managed to downgrade but i get no carrier signal if i check the about in settings it says null… back with 3.0 but would be nice to have this sorted thanks

          • At 2009.03.24 13:43, ibonjour said:

            downgrade easily.. with working signal.. email me for the trick.. ibonjour@yahoo.com

            • At 2009.06.01 21:31, henry said:

              hi, ibonjour, i just upgraded to 3.0 but i want my cydia and installer back, can you kindly show me how to downgrade and get my software back? thanks a bunch..

              henry

          • At 2009.03.26 06:34, jimmy said:

            i RESTORED to 3.0 on my 3g (from 2.2.1) and COULDNT do anything once was complete bc i received the “this phone is not a member of….”…so i RESTORED back to 2.2.1 directly(not 2.0 upto 2.2.1) and did absolutely NOTHING different than a normal RESTORE..(hold shift-WHILE IN DFU MODE OF COURSE! and click restore)…i got the “itune has detected an iphone in recovery mode”….shut down itunes….fired up QUICKPWN and received the Tip that says to hold down POWER **AND** HOME for ****15****seconds…NOT 14.5 or 15.5…****15****seconds…apple logo shows up then boots to an itunes activation screen NOT the DFU RECOVERY screen,started up itunes again and went straight to itunes store and was activated in 5 seconds!…hope this helps….or hasnt already been suggeted…ive always gotten tips from forums so i figured for once id return the favor—Peace

            • At 2009.04.04 19:28, Dr Puttingham said:

              Indeed, I agree with jimmy. I upgraded to OS 3 beta 2 and of course got the “for developers only. Two days later Apple still hasn’t accepted my 99 bucks. Was unable to get my carrier back after downgrading but finally was able to get QuickPWN timed just right and yes indeedy I got iTunes activated and my device is back online with AT&T. My device went back to the 2.2.1 (5H11) and now I’m re-JB’ed
              WAS freaking scary for awhile though.

              • At 2009.05.13 05:22, JAY said:

                i cant get my ipod to get out of recovery and idk if you can jailbreak it if is in recovery

                *****HELP ME OUT*****

                • At 2009.05.13 05:23, JAY said:

                  do you have to have cydia or installer to jailbreak????

                  pleaz reply

                  • At 2009.05.25 18:52, MEINY said:

                    I have tried upgrading and updating my 3G iPhone but cant seem to get any carrier signal, wont even show waiting for activation on screen, I have done it loads on my 2G iPhone with no problems :( I use iTunes 8.2 and quickpwn betas as I am trying to use bates firmware, I have also tried on my Mac as I normaly use pc. It is a contract phone but dont thinks that should have anything to do with it…
                    could some bright minded person please help me out…

                    • At 2009.06.12 11:34, Brannon said:

                      So I was stupid tonight. I upgraded to 3.0 on my unlocked, jailbroken iphone3G. I’m in the process of trying (from DFU mode) to downgrade back to 2.2. I’m more concerned about the unlocked part than I am the jailbroken part. Anyway, I keep trying Jimmy’s technique above with no luck. I’m going to try a few more times then try to sleep, but any advice would be appreciated.

                      I’m T-mobile and in the USA and I bought the phone already unlocked. I was under the impression that the unlocking was a hardware thing, otherwise I would have done more research before going to 3.0. I hope I didn’t blow it!

                      Thanks i advance.

                      • At 2009.06.13 19:57, Unlock iPhone 3.0 said:

                        I have just upgraded it 3.0 and now cannot get a signal, im on t-mobile, anyone else had this problem or got any suggestions?

                        • At 2009.06.18 16:12, tom said:

                          hi, could someone help me please. I’m not a computer buff, but i really need to know how to downgrade the firmware from 3.0 to the last one, 2.1.1 (my iphone is unlocked and so will not accept the new 3.0)?
                          anyone who can give me a step to step guide would be a lifesaver (the article says something about using itunes for this, how do i do this please?)
                          email hollywood_kills@hotmail.co.uk
                          with any suggestions/help.
                          thank you

                          • At 2009.06.18 22:39, Kresho said:

                            Hello i have the same problem as the last two guys please help me through coz i have downloaded the new software but i can’ downgrade it through those methods that are shown here are not working for me :S in i’tunes it says that the sim is unrecognizable HELP !:)

                            • At 2009.06.19 08:47, Chaneladdict said:

                              hello I’m having difficulty in restoring my iphone 2g back to ipsw 2.0.2 since i upgraded it in os 3. Can somebody pls hep me!

                              • At 2009.06.19 08:48, Chaneladdict said:

                                is there any way i can unoc my iphne 2g without down grading it?

                                • At 2009.06.19 08:48, Chaneladdict said:

                                  pls somebody hep me.. i terribly hopeless!

                                  • At 2009.06.19 11:02, uk-spurs said:

                                    I have 8GB UK Iphone 3g its never been jailbroken, I did make the now common mistake of updateing my software via itunes can my phone be jail broken or am I left stranded?
                                    any advice

                                    • At 2009.06.22 02:34, moqipet said:

                                      i did the update of my iphone from 2.2.1 to 3.0 without restore it. now the phone lock and cannot restore back to 2.0, how?

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