FOR THOSE WHO WANT TO DOWNGRADE FROM 1.1.3 JAILBREAK to 1.1.2 JAILBREAK
First of all, I attempted a soft-upgrade to 1.1.3 using installer.app but I ran out of room on the iPhone, causing the iPhone to change colours, flash on and off, and then crash. I thought the phone was bricked because it was extremely hot. I then tried to downgrade to 1.1.1 but it did not work immediately. This topic outline my numerous failures, and eventual success.
I have encountered MANY MANY problems when attempting this procedure, but after 8 hours and numerous failed attempts, I am back to 1.1.2 Jailbreak. I will outline some of the problems I encountered and what I did to help the other members of this forum.
The first problem I encountered was error 1605 when downgrading to 1.1.1. I encountered this error when using iTunes 7.5 to downgrade the firmware, ultimately making it impossible to use iNdependence. The 1605 error means that the downgrade has failed and the firmware remains unaltered. Error 1605 can be a good thing as I will later show you.
To overcome error 1605, download iTunes 7.6 and use the NEW version of independence. You should now have a 1.1.1 iPhone with error 1015 as normal.
Next, jailbreak and oktoprep as usual. NOW when you try an upgrade to 1.1.2, you will see that the iTunes symbol IS NOT THE SAME as the first time you jailbroke your iPhone. The 1.1.2 Jailbreak also DOES NOT WORK correctly. It took me hours to overcome this problem, but I found a solution.
First of all, uninstall iTunes 7.6 and reinstall 7.5. Make sure to delete the iTunes library file so iTunes will launch properly. Next, try to restore to 1.1.1. Of course, you will get the 1605 error, meaning the itunes downgrade had failed. Now upgrade iTunes to 7.6 and launch iNdependence. It will kick your iPhone out of DFU and you will notice that SSH and Jailbreak are installed, while you are in 1.1.2!
I was about to throw away my iPhone but many failed attempts led me to my eventual success. If you find this guide helpful, please leave a comment or give me ++rep.
I will answer all questions to the best of my ability,