If you are not satisfied with iOS 6 GM, then here is the tutorial to downgrade iOS 6 GM to iOS 5.1.1. With this downgrade you can enjoy untethered jailbreak which you can’t with iOS 6 GM.
Requirements for downgrade:
iOS 5.1.1 IPSW file [Direct Links]:
Latest Version of iTunes:
Step by Step Tutorial to Downgrade iOS 6 GM to iOS 5.1.1:
Step 1: Connect your iDevice to your Windows or Mac PC via USB cable and fire iTunes.
Step 2: After selection your Device in iTunes, hit the ‘Shift’ button Windows or ‘Alt’ on Mac on your keyboard and choose ‘Restore’.
Step 3: Now select the firmware you want to Downgrade to.
Step 4: After you have selected iOS 5.1.1 ipsw file, hit the restore button and wait until iTunes finishes restoring your iDevice.
NOTE: It will take 10 to 15 minutes to restore, and then you’re done.
After the restore process is finished you can surely re-jailbreak your iPhone, iPad or iPod Touch using the latest version of Absinthe Jailbreak tool. Here is the download and tutorial for jailbreaking ios 5.1.1.