Downgrading from 4.3 to 4.2.1 on 3GS

Discussion in 'iPhone' started by flatlined, Mar 18, 2011.

  1. flatlined macrumors member

    Jun 9, 2010
    I did the update to 4.3 and would like to go back to 4.2.1, Has anyone done it? From what I've read I download a copy of 4.2.1 of for the 3GS, which I Did ,place it on your desktop, while connected and in itunes hold the shift key and press restore, you will be able to browse to firmware, select the copy of 4.2.1 and let itunes restore. Also I downloaded tiny umbrella incase I got an error 1015.

    Has anyone else done this?

  2. Ashin macrumors 6502a


    Jun 19, 2010
    You need SHSH blobs saved for 4.2.1, do you have them?

    If not, no, you can't.

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