How do you downgrade from 4.2.10 back to 4.8.10?

Discussion in 'iPhone' started by metzy25, Aug 12, 2011.

  1. metzy25 macrumors 65816


    May 7, 2011
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_8 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8E401 Safari/6533.18.5)

    I have a iPhone 4 and was looking into how too do this? Is it possible? And how do I do it?
  2. jonrando macrumors 6502a

    Jun 22, 2011
    There is no iOS 4.8.10.

    If you meant 4.2.10, then you can't unless you saved your SHSH blobs because Apple stopped signing previous versions of iOS.

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