Game tester online

Why?

Cause cant to downgrade from Device, must be use PC
And also considering the following points

the default Firmware 1.13-(23/05/2014)
1.14-strange Camera, sometimes partially, some colored in black and white. WiFi bug on WPA2-PSK
1.15 camera-better WiFI bug, but increasingly rampant (and withdrawn from the Asus website)
1.16-yet it appears the clarity

Make sure the drivers already installed ADB on MTP and PTP mode
    Go into Settings > About > Software Information. Tap repeatedly until the number appears Build Description "You are now a developer!"
    Go into Settings > Developer options. Check USB Debugging
    Plug the cable from your computer to Zenfone
    Wait until the driver for MTP ADB installed
    Go into Settings > Storage. Tap the upper right corner on the coat of arms of the dressing, so USB PTP
    Wait until the driver ABD for PTP installed
    Invert again became the MTP
    ABD Driver already installed

Steps Downgrade to 1.13 (2014/05/23)

This Tutorial for ZF5 ASUS_T00F (A500CG) series World Wide (WW)
DISCLAIMER, the failure of my own, Ive tried twice to. This stuff is expensive, if not too know what is ADB, Fastboot, Recovery Mode, my advice, try accompanied the familiar course.
WARNING: applications, application settings, save games, sms chat, the content WILL BE LOST, along with ALL data in the internal memory is ALSO gone!! BACKUP used to be before.

    Download THIS FIRMWARE (source: this)
    Open/Extract ZIP file, if it is opened the ZIP file again, it will be used.
    Rename the short name like so: WW113408 .zip
    Turn off the your Zenfone 5
    Enter Fastboot Mode (hold Power + Vol Up), hold up sign in
    Select Recovery (Vol Down and Up as navigator, Power as OK)
   When the Android logo appears with an exclamation point, press and hold the Vol + Vol Up          Down at the same time
    Select Wipe data/factory reset
    Select Yes, delete all user data
    Select the Apply updates from ADB
    Back to the computer, go into the Device Manager on the computer
    Check that the Zenfone already installed and detected in the ADB mode

 If not detected,

Open your browser again, download Android-PlatformTools .zip, extract up to anywhere
paste file WW113408 .zip earlier in the same folder with adb .exe extracted results from AndroidPlatformTools .zip
Hold Shift + right click the folder Platform-Tools, then choose the Open command window here
Type: adb devices
If the device code and there is a description of sideload, sideload process couldve done

Type: adb sideload WW113408.zip
Wait process sideload zip ke device