How to Manually Update to Kitkat Zenfone 5/6 Without Error

Zenfone Kitkat

Before Update to Kitkat:

• Make sure no disabled/freeze/deleted apps for stock apps from asus
• If you have already made modifications please revert back to original firmware (How? Here)

Resources to Download: (Kitkat/4.4.2 Version is V2.19)

• Download Recovery img for Kitkat (Download for Zenfone 5/Download for Zenfone 6),(Mirror Zenfone 5 / Mirror Zenfone 6) password : www.asus-zenfone.com, based on your firmware version (WW/TW/CHT)
  
• Download Zenfone 5/6 Kitkat ROM (Make sure your download version is the same with recovery version above) (Kitkat ROM for Zenfone 5 / Kitkat ROM for Zenfone 6)
• ADB Driver 
• Intel USB Driver

Instructions:

1. Download ADB and Extract it, Download Intel Driver and Install
2. Download Recovery 
3. Download Zenfone Firmware 
4. Copy recovery img to ADB Folder and Copy .zip firmware to ADB folder too (make sure you extract the firmware first then copy to adb folder).
5. Activate USB Debugging on Your Zenfone and Connect it to PC/Laptop via USB Cable (How to Activate USB Debugging? HERE)
6. Open CMD at ADB Folder by Hold Shift+Right Click and Open Command Window Here
7. Type this on Command Window: adb reboot bootloader and wait until your zenfone enter fastboot mode
   
8. When succeed enter fastboot then flash recovery, at Command Prompt type: fastboot flash recovery <filename.img> and wait until finish
   
   
9. Choose Recovery, when android robot appear press volume down+volume up and choose update from ADB. Now Flash the firmware via ADB, by type ADB sideload <firmwarename.zip>
   
10.  Wipe Data and Reboot