I hv Pwnage's Custom restore file which is installed into 2 iPhone 2G successfully. But, when I try to install into another iPhone (Locked 2.0 version), Pwnage's restore file (3.1) can't be install!

How can I do?

What's the error message? Did you try in DFU mode?

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB

Error 1604, tried in DFU mode.

May I restore it to 3.1 (Apple), and use Pwnage 3.1 to JB/unlock it with Custom 3.1?

Upgrading to 3.1 and then reloading pwnage custom 3.1 will work, but so should restoring directly to custom 3.1 so I don't think there is much point in trying that first. You can get 1604 error from a legit firmware as well.

The cause of 1604 can be various things. So there is not one single solution for this error.

• Validate you are using the correct firmware. You can get this if you are using an incompatible firmware (for example 3g ipsw on 2g iPhone).
• Restart your computer and try again.
• Try switching USB ports
• Create a new account on your machine that has admin rights and try with that account.
• Try another computer
• Check that ~/Library/iTunes/Device Support or %ApplicationData%\Apple Computer\iTunes\Device Support is empty and that you have write permissions to it.
• Try restore mode instead of DFU (especially if iPhone has been jailbroken before)
• Try everything applicable in the Apple troubleshooting document Update and restore alert messages on iPhone.

Now I got 2 iPhone 2G from my friends, one restore to 2.0, one restore to 3.1! I can't use upgrade because all of them are non-active. (non-JW and non-active) I hv try to restore custom 3.1 into those iPhone, iPhone 3.1 error is 1600; the iPhone 2.0 error is 1604.

I can do it with Redsn0w 0.8 now. Unlocked with 3.0.