Step 1: download 2.1 Firmware from the internet (iphonefirmware.com)
Step 2: download quickpwn GUI app and install (quickpwn.com)
Step 3: backup your iphone (if you haven’t already)
Step 4: launch quickpwn, point to the oem firmware you downloaded in step 1 and off it goes
Step 5: follow onscreen instructions
(combination’s of holding power button and stuff)

..it’s that simple.. Special Thanks to TrusT for this!