From reading the comments on the dev team blog it looks like you need to use PwnageTool to put the phone into DFU mode (it does some special magic DFU mode) to restore the firmware that it creates. It looks like windows users are getting errors during the restore when using normal DFU mode with PT created ipsws. FYI
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Just a warning to windows users wanting to use PT created ipsws
- Thread starter Shaddow825
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I don't think you would have a problem, you just need to let the tool to get your phone into DFU and not do it yourself manually.
I'm guessing that as long as you go through the DFU process on a Mac, and restore as new, you can then take your iPhone to your PC and sync your music, movies, contacts, apps, etc.
I would suggest restore as new anyway, so maybe this isn't as bad as it seems. I've just never gone past the creation of the custom firmware on my friends MAC.
This is just what I did. Did all the PT stuff on my mac, got it to the point where it was asking me to set up as new or restore backup. I disconnected it and took it to my PC, same choice screen came up, and I restored from my backup taken right before the restore.
If you're desperate, you can run OSX in a virtual machine and do it that way. Best would probably be to just upgrade through iTunes and run limera1n/greenpois0n. (Especially if you've got an iPhone 4 since you can use tinyumbrella to preserve the baseband)
The latest comments there are trying this and not having any luck. Something isn't happening when putting into DFU from the VMs.
I haven't tried with this particular method since I don't have the need to, but I have successfully used DFU mode through vmware before (I'll admit it took *several* tries though)
Normal DFU mode works just fine. This DFU mode is different. It somehow uses and exploit to break the chain of trust so that custom firmware will be accepted by the phone, and that is what isn't getting through from the VM apparently.
Lol 
Im borrowing a friends macbook tommorow
Im borrowing a friends macbook tommorow
Used Mac Minis are cheap
Do we need to host local jailbreaking parties?
Yes. Point RedSn0w to a good 4.1 ispw to start the process. That will eventually get you to a point where you'll be able to restore to your pwned ispw.