iPhone DevTeam has released a new version of Yellowsn0w, their unlock software for the iPhone 3G.

According to the DevTeam, this new version, v0.9.5 beta, should fix quite a few problems, including some STK SIM issues. As such, if you did not manage to get the previous versions to work, it is suggested to try the new Yellowsn0w version… or maybe wait for final v1.0 release.

As before, Yellowsn0w is available via Installer.app/Cydia at the following repositories:http://apt9.yellowsn0w.com (Cydia) or http://i.yellowsn0w.com (Installer.app).

And, of course, prior to being able to use it, you will need to upgrade your iPhone 3G to the latest iPhone firmware version (v2.2) from Apple and then use QuickPwn to activate and jailbreak the device.

Installation instructions and additional notes are below…

To use it:
1. Install BossPrefs and Yellowsn0w from Cydia/Installer
2. Disable everything in BossPrefs
3. Reboot your iPhone using BossPrefs
4. Wait for the iPhone to boot up
5. Take out your SIM card and reinsert it back in
6. Wait a moment or two
7. In settings turn on Airplane mode
8. Turn off Airplane mode
9. All done!

Additional notes:
- As of v 0.9.4 there’s no longer a one-minute delay step. If you don’t see your carrier when your homescreen comes up, you may still need a SIM reinsert (for now).
- If you are in the U.S. and are trying this with T-Mobile, you must turn off the 3G switch in Settings.
- No PIN support yet
- The unlock will silently quit on anything other than baseband 02.28.00. It detects the wrong version and just quits to avoid any damage. Please double check your Modem Firmware setting in Settings->General->About.