Here's an interesting application you may want to look over if you're having trouble trying to jailbreak your iPhone. It's an application called ZiPhone, which will let you jailbreak any iPhone version, including those running on firmware 1.1.3.

Version 2.2 on particular was released to correct a typo error that was causing problems over in version 2.1. Here are the two versions' successive changelogs:

• Version 2.2:
• Removed bug in 2.1 didn't allow my "Z" icon to be deleted
• Version 2.1
• Corrected the "Apple logo bug".
• Removed -v option (now it's always booting in verbose mode)
• Added integrity check on zibri.dat.
• Added 2 .BAT files for windows newbies :)
• Updated README.txt
• OSX versions updated.
  

There are two version of ZiPhone available for download: One for PC users, and one for Mac OS X users. We strongly advise the readers to view the file bundle's readme for full instruction on how to use and install this application.

You may also want to visit the Zibri's site to post your feedback. It's available via the source link below.

Download: ZiPhone v2.2 (PC)
Download: ZiPhone v2.2 (Mac OS X)