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Thread: How To: fix 1015 errors downgrading from 4.3 to 4.2.1 3GS new bootrom

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3G[S] Downgrading

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Jailbreak / Downgrading / Upgrading

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Make sure gs.apple.com points to cydias servers (plenty of ways to do this) and that you have 4.0 SHSH on file. Downgrade to 4.0 using DFU, use tiny umbrella to
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  1. #1
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    Default How To: fix 1015 errors downgrading from 4.3 to 4.2.1 3GS new bootrom
    Make sure gs.apple.com points to cydias servers (plenty of ways to do this) and that you have 4.0 SHSH on file.

    Downgrade to 4.0 using DFU, use tiny umbrella to kick device out of recovery mode (this does not seem to work when you go from 4.3 to 4.2.1!)

    Then upgrade to 4.2.1 using iTunes (DO NOT RESTORE to 4.2.1) and again, kick device out of recovery and hey presto you have a working 3GS again on 4.2.1. Continue to jailbreak like normal.

  2. #2
    What's Jailbreak? Psyko's Avatar
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    Why would ANYONE (!) want to restore to 4.0? 4.1 is HEAPS faster, and so much more stable. 4.2.1 is also out, and hell it's even faster than 4.1! 4.2.1 is really as fast as 3.1.3!

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    maybe you should READ THE POST PROPERLY

    This is for people HAVING ISSUES downgrading FROM 4.3 to 4.2.1.

    Also if you would have read the post properly you would have noticed that you will actually end up back on 4.2.1.

  4. #4
    What's Jailbreak? Psyko's Avatar
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    I could've sworn this thread was about downgrading to 4.0. Either you edited the numbers in hyper speed or I read it wrong. Sorry, lol.

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    Nope no editing lol

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