You can now download and install firmware version 13.8.26.92 on your Asus ZenFone Max (ZC550KL) handset with WW SKU using the official link and updating instructions provided here.
Asus ZenFone 2 (ZE500CL) 12.16.5.118 Firmware Update
Asus has officially rolled out a minor new update, v12.16.5.118, for its ZenFone 2 (ZE500CL). This update increases ringtone volume, improves ZenMotion stability and adds Asus’s Mobile Manager app.
Download ZenFone 2 Firmware 12.16.5.102 WW [Stagefright Fix]
Asus ZenFone 2 ZE500CL is receiving a new update (version 12.16.5.102) primarily aimed at patching the Stagefright bug. This version will also let you download apps directly to the external SD card.
Asus Zenfone 2 (ZE500CL) Firmware 12.16.5.70 Update [WW]
Asus Zenfone 2 ZE500CL (Z00D) is getting a minor new firmware update, version number 12.16.5.70, aimed at bringing support for Zenflash Camera and optimizing inbuilt apps including Themes and Power Saver. You can download this update below.