Apple Chief Executive Steve Jobs holds the new iPhone at the Apple store in central London, Sept. 18 2007. (Xinhua/Reuters Photo)

BEIJING, Sept. 28 (Xinhuanet) -- Apple on Thursday released its biggest iPhone software update yet, which for the first time also delivered a warning to users of unlocked devices.

The majority of the flaws do not appear to be critical, but iPhone Version 1.1.1 fixes a larger number of bugs than the first iPhone update, released July 31, it said.

It adjusts the speakerphone and receiver volume problem, adds the ability to view e-mail attachments in portrait or landscape mode, and patches 10 vulnerabilities, most of which are related to the built-in Safari browser.

Before the update installs, however, it displays a security message -- the first time Apple has done this on iPhone upgrades -- that essentially repeats the warning the company issued Monday: that modifying the device voids its warranty and may leave it incapacitated.

The warning triggers wide speculations about whether the update "bricks" modified phones, particularly those that have been unlocked using one of the several hacks circulating on the Internet.

Reports said some users claimed that the update broke all unauthorized, third-party applications added to iPhones using the popular Installer.app. Others reported that unlocked iPhones returned SIM errors after the update, requiring that they restore the phone to its out-of-box state. But the results seem to be subjective, and it may also be too early to really tell.

(Agencies)