Apple has released firmware update 3.1.2 (7D11) for iPhone/iPod Touch.

This is a minor update to firmware 3.1 that was released on September 9 2009 and supports iPhone, iPhone 3G and iPhone 3GS. There is a separate update for iPod Touch users.

For Rogers/Fido iPhone owners, there is no new carrier file and the modem firmware was retained at 05.11.07.

Below are the updates in firmware 3.1.2:

• Resolves sporadic issue that may cause iPhone to not
  wake from sleep
• Resolves intermittent issue that may interrupt cellular
  network services until restart
• Fixes bug that could cause occasional crash during
  video streaming

I have actually been looking forward to that second one, as that is something my iPhone 3GS is occasionally plagued with.

Remember, if your iPhone/iPod Touch is jailbroken and/or unlocked, you should not immediately update to 3.1.2, as you may lose both your jailbreak and unlock.

Note from the Dev Team Blog:

WARNING! At 10.20AM PDT on October 8th 2009 Apple released the 3.1.2 version (7D11) of the iPhoneOS.

If you care about your jailbreak and unlock, don’t update your device - 3G and 3G(S) owners should pay particular attention to this warning.

PwnageTool and redsn0w are not yet compatible with 3.1.2

There is no estimated release time for compatible tools (please don’t bug us about this).