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  1. urbanmojo's Avatar
    Hi:

    Trying to find complete instructions for this situation. I have a 3G with 4.0 OS and want to downgrade--I understand 3.1.2 is a better option than 3.1.3. I had 3.0 before the upgrade to 4.0. I have a Macbook Pro.

    Please provide links to the best programs ipsw etc. to accomplish this. Do I just proceed with a DFU etc restore to a 3.1.2 ipsw as if I never had 4.0? Will I be able after the jailbreak to restore from a backup?

    Thanks!
    2010-09-07 03:04 PM
  2. Captinsmooth's Avatar
    You should be able to downgrade to 3.1.3 without an issue. Then jailbreak with jailbreakme.com
    This post infers no rights and is provided as is.

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    2010-09-07 04:53 PM
  3. Simon's Avatar
    If you have an original carrier sim to activate then you can do what Captinsmooth said no problem. If you don't and you need to hacktivate then you have two options. You can go to 3.1.2 and use blackra1n (probably the easier method) or use redsn0w on 3.1.3 or 3.1.2.
    2010-09-07 05:16 PM
  4. urbanmojo's Avatar
    also, do I have to use Tiny Umbrella to downgrade?
    2010-09-07 08:45 PM
  5. Captinsmooth's Avatar
    You don't have to, you can just edit your host file to direct it to cydia. TinyUmbrella is easier to use though.
    This post infers no rights and is provided as is.

    Click here to follow me on twitter
    2010-09-07 09:01 PM
  6. urbanmojo's Avatar
    help! Did a restore to 3.1.2 and now I am in recovery mode. I am stuck and cannot go into DFU for redsn0w to work. iRecovery seemed to work at first but can't shut off the phone, just keeps rebooting. Didn't do any of that Cydia stuff previous to downgrading. Am I screwed?
    2010-09-07 09:37 PM
  7. Captinsmooth's Avatar
    Just let the phone restore in recovery mode. Then start over.
    This post infers no rights and is provided as is.

    Click here to follow me on twitter
    2010-09-07 09:41 PM
  8. iYeow's Avatar
    help! Did a restore to 3.1.2 and now I am in recovery mode. I am stuck and cannot go into DFU for redsn0w to work. iRecovery seemed to work at first but can't shut off the phone, just keeps rebooting. Didn't do any of that Cydia stuff previous to downgrading. Am I screwed?
    Downgrading from 4.0 to 3.1.2 will not finished without an error. If the error is 1015, you are in recovery loop. Use tiny Umbrella, there is a box " kick out of recovery " to get out of the loop.
    2010-09-07 11:50 PM
  9. urbanmojo's Avatar
    Can I still use Tiny Umbrella? I didn't save my blobs before attempting to downgrade from 4.0 to 3.1.3. Isn't saving those blobs what TinyUmbrella does? Or does it also allow me to downgrade after the fact even if I didn't save the blobs?
    2010-09-08 02:38 AM
  10. iYeow's Avatar
    The latest tiny umbrella also has a function for you to get out of recovery loop.
    2010-09-08 05:11 AM
  11. i.Annie's Avatar
    When you downgrade and get error 10xx, like yeow said use tinyumrella to kick it out of recovery. This should boot your phone to the emergency call screen. If you went to 3.1.3, use Redsn0w 0.9.4 and point at the 3.1.2 ipsw. If you went to 3.1.2 use Redsn0w 0.9.3 with the same 3.1.2 ipsw.

    I dont recommend Blackra1n, but it can be used with 3.1.2. I just think Redsn0w is more stable and up to date. Just make sure youre downloading the right versions that I mentioned.
    2010-09-08 05:55 AM
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