can we put iphone 3gs into DFU mode with out power button
My Iphone 3gs power button not working, so is there any way I can put my iphone into DFU mode..
iPhone 3GS, iOS 5
No - you can't put the phone in recovery mode or DFU mode without a functioning sleep/wake (power) button.
Note that DFU mode is only useful when hacking the phone. Recovery mode is what you want for troubleshooting.
http://www.ihackintosh.com/2009/06/recovery-mode-and-dfu-mode/