Just a quick heads-up: ultrasn0w has been updated to v1.2.3 to be compatible with iOS 4.3.3 and earlier (the ultrasn0w update does not include any new baseband support!). Please reboot your iPhone using the normal “slide to power off” swipe after installing ultrasn0w 1.2.3.
ALSO READ HOW TO: Use Redsn0w 0.9.6rc15 To Untethered Jailbreak iOS 4.3.3 [Mac & Windows ]
ALSO READ HOW TO: Use PwnageTool To Untethered Jailbreak iOS 4.3.3
ALSO READ HOW TO: Use Sn0wbreeze To Untethered Jailbreak iOS 4.3.3 And Verizon iOS 4.2.8 [ Windows ]