iPhone update 3.0.1 is here and it addresses an SMS bug, if you’re on a jailbroken iPhone you probably want to update now and keep your applications/settings intact.

You can re-use redsn0w v0.8 we released a few weeks ago to jailbreak today’s 3.0.1 update. Just let iTunes update or restore you to official 3.0.1 then run redsn0w. The only “trick” is that when redsn0w asks you to identify the IPSW used, point it at the 3.0 IPSW instead of the 3.0.1 one. After the jailbreak, reinstall ultrasn0w 0.9 if you need the unlock.

1. Download aptbackup in Cydia this backs up a list of all the applications you have downloaded. Run the back up within aptbackup and then sync your iPhone to to iTunes (to backup within iTunes).
2. Update your firmware via iTunes. Once the installation is complete load up redsn0w.
3. When redsn0w asks for your IPSW browse and select the 3.0 firmware file (presuming you still have it on file, if not you can download it here)
4. Jailbreak.
5. Restore your applications using the aptbackup backup.

This is the method i’ve been using and it seems to work well.