iphone-hacks.com

*OUTDATED*

- Start with a 1.1.1 or 1.1.2 jailbroken phone with Installer.app installed.

- Plug in your phone via USB to your computer.

- Download the 1.1.3 package maker (http://www.iphone-hacks.com/downloads/file/82) and open it, then run "Run_This" by double clicking it. (If it doesn't do anything open terminal located in /Applications/Utilities and drag and drop the "Run_This" onto the Terminal window.) Read carefully, press Enter when necessary, and the image will be uploaded to your phone. Then skip to the Installer part below.

- When it finishes (should take about 10 minutes), it will tell you to go to Installer and install the "1.1.3 soft upgrade" package. Do that.

- The upgrade will stall at about halfway. THIS IS NORMAL. DO NOT INTERACT WITH YOUR PHONE WHILE THIS IS HAPPENING. Just leave it plugged in and leave it alone.

- When the installer finishes (this should take another 10-15 minutes), your phone should reboot with a fresh activated 1.1.3 firmware. (If within 10-15 minutes it doesn't do anything and it takes you back to the homescreen, simply open the Installer.app and it should start to reboot - do NOT hard reboot your iphone Just be patient.)

Source: cre.ations.net