Try this.
http://www.iphoneforums.net/forum/h...s-68/dfu-mode-broken-home-power-button-57334/
Sent from my iPad using Tapa
I just get ISPW is not supported message?
You're doing something wrong then. Here's a premade iPhone4,1_7.1 DFU IPSW made using the same procedure. Just Shift/Command + Click Restore in iTunes and point it to it.
Read the thread. That's the point of the DFU IPSW..... All it's supposed to do is place your device into DFU mode by interrupting the LLB sequence during an actual restoration procedure. When you get the iTunes error, your device will be in DFU mode, after which you can select the clean 7.1 IPSW that houses the actual firmware and not a modified bundle so that you can actually unarchive it and install using iTunes.