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mash potatoz

macrumors newbie
Original poster
Nov 26, 2010
1
0
I have a iphone 3g and updated the official ipsw 4.2.1 through itunes. I want to jailbreak it so I updated through itunes and not knowing I had to get a Costume ipsw via (http://www.felixbruns.de/iPod/firmware/). So for my question, Can I some how overwrite the official ipsw from itunes with the custom ipsw (4.2.1)? Maybe downgrade to 4.1 then try the costume ipsw?
Please help, thnaks for your time.

I also heard that the new unlock for Baseband 05.15.04 is being released Sunday and it so happens I had it too.
 
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