Asus ZenFone 2 Laser ZE550KL has a new firmware update (version 18.104.22.1686) which implements improved autofocus speed and enhanced 3G/4G network speed. You can download this firmware via the direct download link provided below.
Asus ZenFone 2 Laser ZE500KL has got a new update too. This build, version 22.214.171.124, applies fix to the Stagefright vulnerability and improves the performance of touch auto-focus and zero shutter lag. You can download this update’s official zip package below.
Asus ZenFone 2 Laser ZE550KL has a new update, version 126.96.36.1999. The official changelog is quite long, though the update generally appears to improve network stability & call quality and fix issues with double tap to wake feature.