It doesn’t work with the following basebands:
There are various other GUI and iBooty bug fixes included in this update as well. Keep in mind that this is still a beta release so there might be more bugs that could ruin your experience.
Download sn0wbreeze 2.3b4
If you’re using a Mac, check out our guide on how to jailbreak iOS 4.3 on iPhone 4/3GS using custom PwnageTool bundles (this is also a tethered jailbreak by the way)