Apple has pushed a new firmware update, v3.1.3, out to iPhone and iPod touch owners. The release is a minor one, fixing bugs rather than adding any substantial features. Key among the changes is better battery meter accuracy for the iPhone 3GS, addressing a long-standing complaint. Also fixed are crashes when using the Japanese Kana keyboard, and a problem preventing third-party apps from launching.

Several security flaws have been closed, including exploits made possible with malicious TIFF or MP4 files, and memory corruption under a USB control message. Two more vulnerabilities have been corrected in WebKit: one involving malicious FTP servers, and another which loads remote audio and video in Mail even when the option is disabled. iPhone and iPod owners must download the new firmware through iTunes.