Hello, so, i have an iPhone 3Gs old bootrom with iOS 4.0.1 jailbroken with jailbreakme.com.I did't upgrade, cause I didn't need functions like AirPrint or Hotspot (I was satisfied with MyWi). However nowadays many Apps require iOS 4.1, 4.2 or even 4.3, so I want to upgrade now. But there are certain problems: 1. My iTunes says my iPhone has to be restored, I can't make a backup. Can I just copy all of my AppStore Apps out of my Application folder (with AFP) and after the upgrade just copy the back? And the main problem (that's why i'm posting in this section): My Power-Button is broken and as far as I know, redsn0w requires the DFU mode, which I can't enter without it. Does Pwngetool require it or can I, when I'm done with the custom ipsw just restore my iPhone with it? Or are there any tools for my mac to put my iPhone into DFU mode? I found this: http://limitededitioniphone.com/how-to-put-the-iphone-into-dfu-mode/ However I have just a mac and I also read, that this isn't working for the most of windows users. I would be really thankful if you could help me out.