Apple released the latest version of its iPhone firmware, 1.1.4, which fixes several undisclosed bugs. Unlike the latest version, the 1.1.4 firmware does not add any new features and it could be just an usual update before the release of the widely-expected iPhone SDK.

Announced in October 2007 by Steve Jobs himself, the iPhone SDK, which will open the phone’s platform to the third-party developers, was scheduled to be released this month.

But so far Apple stayed mum about the fate of the SDK, but earlier this week BusinessWeek reported that the release could be delayed to one to three weeks.

According to the several reports, the new update, which weighs in at over 160MB, improves the way in which content tabs will load in the Safari browser, it fixes Bluetooth connectivity and, according to MacRumors, some users said the camera works better.

Also, some reports from iPhone Atlas readers, indicate that the new firmware have boosted the cell signal strength.

Also, iPhone Atlas said that unlike the previous firmware update, the 1.1.4 can still be jailbroken. Jailbreaking is the generic name of the hacks used to allow access to the iPhone and iPod Touch file system in order to install third party applications. Though, iPhone Atlas noted that “iPhones running software 1.1.4 used on unauthorized networks cannot be artificially activated with current tools”

The update is available through iTunes for iPhone and iPod Touch.