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How to upgrade 3GS from 4.1 to 4.2.1?

M

mklo

macrumors newbie
Original poster
Dec 8, 2010
6
0
I have a 3GS with 4.1. I would like to got to 4.2.1. I downloaded the 4.2.1 firmware, when I hit shift-restore 4.2.1 itune gave me an error messaage. Can I use other software to upgrade? Thanks.
 
You need the blob for the ios. If you don't have it, you can only install the most current ios.
 
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