Just completed successfully an update to the untethered iOS 4.3.2 with unlocking on an iPhone 3GS, by following these tutorials:
- iClarified for untethered jailbreaking* to iOS 4.3.2 using RedSn0w: http://iclarified.com/entry/index.php?enid=14563
I actually used a newer RedSn0w version either from this link or this link:
- redmondpie for fixed unlocking** using Ultrasn0w Fixer For 4.3.2: http://www.redmondpie.com/unlock-ios-4.3.2-on-iphone-4-3gs-with-ultrasn0w-fixer-for-4.3.2-how-to-tutorial/
Note: The iPhone that I tested is a “newer (fixed) model” — see iClarified, with 06.15 baseband.
This information can be found in the Settings >> General >> About on the iPhone.
* Jailbreaking stands for the modification of the operating system in such a way to be able to install applications from any source.
** Unlocking stands for the modifications of the operating system in such a way to support any mobile carrier (any SIM card).