Earlier, I have written up a post about possible causes & solution for iTunes 16xx error that some of the readers encounter during iPhone jailbreak or upgrade. I, however, have missed one point for 1600 error that occurred when you try to restore the custom firmware (created by WinPwn or Pwnage Tool) in iTunes.
This point is specially for those who have already pwned the iPhone once and plan to upgrade to new firmware version (Say, from 2.0 to 2.0.2 / 2.1) using WinPwn / Pwnage Tool. When you come across the below prompt, you should answer “Yes” and follow the instruction to put your iPhone in Recovery Mode instead of DFU mode.
Recently, when upgrading a pwned iPhone from 2.0 to 2.1, I tried to put it into DFU mode and restore the custom using iTunes. And iTunes prompted me with error 1600.
At first, I wondered if I did not put the iPhone into DFU mode properly. But it’s not. So, I tried to put it into recovery mode instead. And, it works perfectly with custom firmware install. So, when you encounter error 1600 again, ensure you are using the proper mode.
How to put iPhone into Recovery Mode
To put your iPhone into recovery mode, first disconnect your iPhone from USB cable and power off your iPhone. Then hold the “Home” button and connect USB cable again. Keep holding the “Home” button until you see a dock cable pointing to the iTunes icon (or yellow triangle for older version of iPhone or Steve Job logo for pwned iPhone). Now you are in recovery mode.