Just like we provided you with the list of custom IPSW for iPhone 2G and iPhone 3G users, this time we would like to share custom IPSW of firmware 3.1 for iPhone 3GS users as Dev-team seems to have no plans for releasing PwnageTool 3.1.3 for Windows users. You can unlock and Jailbreak your iPhone 3GS with this custom IPSW while preserving your baseband.

This tutorial is about unlocking iPhone 3GS on Firmware 3.1 via Ultrasn0w. Please note that this post is for those users who are on jailbroken firmware 3.0 or 3.0.1. Those of you who have upgraded to firmware 3.1 from iTunes but have saved your SHSH file to Cydia, you can still unlock/jailbreak but first you will have to downgrade your firmware back to 3.0 or 3.0.1. Click Here for details on downgrading your iPhone form firmware 3.1 to 3.0 we shared earlier.

Users on Windows don’t have to wait for Windows version of PwnageTool or Redsnow, following is step-by-step tutorial/guide will help you to fully unlock and jailbreak iPhone 3GS with Firmware 3.1 on a Windows PC.

Finally a good news for iPhone 3GS users! Jailbreak of iPhone 3GS on Firmware 3.1 is possible now. Here is step wise procedure to jailbreak iPhone 3GS running on Firmware 3.1 with PwnageTool 3.1.3. This version of PwnageTool is for those who are on jailbroken firmware 3.0 or 3.0.1, this new version of PwnageTool enables us to update to firmware 3.1 without altering baseband of your iPhone, those of you who have upgraded to firmware 3.1 from iTunes but have saved your SHSH file to Cydia, you can still unlock/jailbreak but first you will have to downgrade your firmware back to 3.0 or 3.0.1. Click Here to know more about downgrading your iPhone 3GS to firmware 3.0 or 3.0.1 from 3.1.

Dev-Team just announced that it has finally managed to Jailbreak/Unlock iPhone 3GS on Firmware 3.1. Dev-Team unveiled this information on their website and twitter status. Their recent tweets about subject are as follows:
Further to my last post, the 3gs 3.1 jailbreak does not apply to OTB or non-downgradable 3.1 device
3gs 3.0 pwned->3.1 pwned. Props to Musclenerd, Wizdaz and thanks Bumble-Bee & ToddJG for testing. (tinyurl.com/y8sr4p3) (tinyurl.com/y8z277l)

iTunes sometimes displays following 1601, 1602, 16xx or 21 error code while trying to restore or downgrade iPhone or iPod with firmware 3.1. iH8sn0w has just released a utility named iREB (iTunes Restore Error Bypasser), which provides a workaround to fix these errors.

Yes, it’s true! AT&T is introducing MMS functionality for its customer on iPhone 3G and iPhone 3GS running on Firmware 3.1. Service will be officially launched on 25th September.

Many users faced problems in unlocking their iPhone 3G with firmware 3.1. In order to unlock your iPhone 3G through Ultrasn0w you should have baseband version 04.26.08. If you have baseband version 05.11.07 then you won’t be able to unlock your iPhone 3G with firmware 3.1 as this version of baseband doesn’t allow your iPhone 3G from getting unlocked via Ultrasn0w. Good news you can still unlock your iPhone 3G through Ultrasn0w but before that you have to downgrade your baseband firmware from 05.11.07 to 04.26.08.

You might have noticed that after upgrading your iPhone to firmware 3.1, all (apps that you have installed manually outside from App Store) Jailbroken apps have stopped working even if your re-install them. So how to run these Jailbroken apps? Jailbroken apps will not work on iPhone OS firmware 3.1 until you patch MobileInstallation file on your iPhone. Here is a step by step guide through which you can unlock Jailbroken apps. You can jailbreak iPhone firmware 3.1 from here and unlock it from here before you may proceed to the procedure below.

Good news for iPhone users who are using Windows. Previously we shared a tutorial through which you can unlock firmware 3.1 using PwnageTool on iPhone 2G and 3G. Dev-team released PwnageTool for Mac users only and now every one is asking for PwnageTool in Windows. So here is a list of custom IPSW for firmware 3.1 on iPhone 2G and iPhone 3G. This Firmware comes with the stock Apple logo and Cydia. After downloading IPSW file, all you need to do is to restore it using iTunes 9.