Attempting to Jailbreak / Unlock iPhone 3G 3.1.3

[LogicFlow]

I was hoping to get some help, my iPhone 3G was upgraded to iOS 4 a while ago, I didn't touch it for like 4 months because it was so slow and I have a T-Mobile G2 Android device.
Anyways now I want to get some functionality out of my iPhone 3G again, so I looked at downgrading to 3.1.3, as I hear this is best for performance.
Successfully downgraded to stock 3.1.3 firmware, now I'm just getting stuck after building the custom ipsw file with sn0wbreeze-V1.4. I have tried everything I could find on the Internet, custom partition size set to 900 MB, re-downloaded everything, re-created everything.
Every time it's the same error!

After using iREB to get my iPhone in "PWNED" mode with the green screen, I hold shift to restore my custom 3.1.3 firmware and after iTunes 10.1.1.4 finished extracting I get error 21. Every time.

The iPhone could not be restored. An unknown error occurred (21).

Any suggestions? Could this because of a newer baseband that's not compatible? Is there any other way to jailbreak unlock my iPhone now that it has 3.1.3 stock on it? Any suggestions are appreciated.

Win 7 Ult 64-Bit

[salander85]

I may be wrong, but I do believe that jailbreakme.com was designed for 3.1.3 and 4.0.1. Go to jailbreakme.com on your iPhone using safari and slide to jailbreak. Enjoy!

[iYeow]

don't use cfw, put iPhone into normal recovery or dfu mode and restore to stock 3.1.3 fw. jailbreak with redsnow 0.9.4 but browse to 3.1.2

[LogicFlow]

salander85, thanks for the tip. the website is sleek and so useful, enjoying a fully jailbroken 3.1.2 iPhone 3G now, on baseband 05.13.04.

[iYeow]

Cool , I am glad you are enjoying the interactions here