iPhone 3GS Downgrade from 3.1 to 3.0

Discussion in 'Latest Tech News and Rumors' started by v1dz, Sep 15, 2009.

  1. v1dz

    v1dz New Member

    Mar 12, 2009
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    3G iPod touch

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    iPhone 3GS have to communicate with Apple’s servers before allowing the installation of any version of firmware (restore or update ) .With the release of Firmware 3.1, Apple’s server has stopped certifying all previous firmware and this makes it impossible to restore your terminal to version 3.0 or 3.0.1. The certification is done through 3 files called IBSS, IBEC and ECID that, once signed, are a kind of “green light” to install the firmware through iTunes.

    IBSS and IBEC files are generated during a firmware restore in iTunes and placed into a temporary folder on your computer. You will have no problem on retrieving this files, but the missing piece of this puzzle is the ECID file that Apple doesent allow you to retrieve for FW 3.0.

    However, in the last Cydia update, Saurik has made available a tool, that has enabled over 50,000 users to save the ECID file.. This certificate resides on a file server available on Cydia and will remain there forever, ensuring that these people can downgrade their iPhone 3Gs to version 3.0, at any time.

    Saurik 's post - http://www.saurik.com/id/12

    Read here

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