Install International WW ROM from CUCC China Unicom Zenfone 5

Method 1

1. Root your Zenfone 5 /Zenfone 6
2. Download WW V1.14.40.50 Firmware (Zenfone 5 Download) (Zenfone 6 Download)
3. ADB (Download) 
4. Extract WW Firmware to ADB folder
5. Go into recovery Volume up + Power to get into recovery modes, then volume down + volume up, hold volume up for 3 seconds. and then you will see ADB sideload. Press on that and get ready to go. 
6. ON ADB Folder Hold Shift+Right Click and "Open command window here"
7. Type "Adb sideload (drop the file into the terminal, don't write this!)" and then press enter, make sure there is a space between sideload and your file name.  
8. Let it install, it will install and then give you an error after saying "cannot load volume /misc!" ignore it, wipe cache and reset. 

 Method 2
Tools and Resources:

1. Intel USB Driver for Android ( Download Here )
2. ADB Fastboot Tool (Download Here)
3. Fastboot.img (Download Here)
4. Platform tools (Download Here)
5. Zenfone 5 Firmware Version V1.16.40.7(WW) (Download Here)
6. Zenfone 5 Firmware WW (Latest) 

Instructions:

1. Extract ADB tools and other resource to one folder
2. Reboot your zenfone to Fastboot mode (Power + Volume up)
3. Connect Your Zenfone to PC /Laptop
4. Open CMD then go to ADB and resource directory
5. Then type: fastboot flash fastboot fastboot.img 
6. Reboot then Go to recovery and select update from adb
7. Open CMD then go to ADB and resource directory
8. Then Type: adb sideload UL-ASUS_T00F-WW-1.14.40.16-user.zip
9. (UL-ASUS_T00F-WW-1.14.40.16-user.zip is the name of firmware you downloaded earlier you can change it to update.zip or anything) 
10. Go to recovery again and select update from adb
11. Open CMD then go to ADB and resource directory
12. Then Type: adb sideload xxx.zip (xxx=the name of latest firmware) 
13. After complete do double wipe (Tutorial Here)

DWYOR (Do it With Your Own Risk)

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Zenfone 5 Install International WW ROM Tutorial

1. Go to Here (Driver and Tools > OS Android and Download the lastest version of WW ROM same with your zenfone 5 type T00J/T00F)
2.  After download done, extract file, you will receive a zip file. Rename zip file to: 
• If current rom is TW: rename zip file to UL-ASUS_T00F-TW-2014.3.27.935705-user.zip
• If current rom is CN: rename zip file to UL-ASUS_T00F-CN-10000.11.40.1-user.zip
3.  Wipe Data (tutorial Here)
4.  Copy  ROM ZIP file to the root directory of phone memory ( that is placed directly under the root directory of the phone  not on any folder ) , remember not to decompress 
5.  Un plug your cable, (may be wait about 30s) => you will receive update notification. Touch it to update :)

- make Sure your zenfone > 20% energy (or you should charge your phone). If not, may be you will not receive any update notification
- After up other rom (your zenfone is CN up to WW rom, TW up to WW or CN up to TW rom) your zenfone will not update through OTA :( (to update, you must go to asus download center to download and manual update)

If error/can't change to WW : Follow this step

Zenfone 6 Install International ROM Tutorial

want to experience the international version ROM for Zenfone 6, the china version of the ROM's built-in software in a quandary, the international version of the ROM is relatively pure, and with the Taiwan version of ROM as have retained the Google service pack, here is a ZenFone 6 Latest International Edition ROM 2014.04.20 version.

Read this First: 

1. This ROM is the official version of the Asus ZenFone 6 2014.04.20 international ROM version , not applicable for ZenFone 5, please know!
2. Install from original version (china) to International version
3. International Edition requires double clear wipe, make sure to back up call records and text messages and other important data from the phone
4. International Edition is not available OTA upgrade! Need to manually upgrade!

Comparison before and after the upgrade software information :

Left CN version, right WW version

Installation steps:

1. backup phone data 
2. Clear data + cache (tutorial here)
3. Download the latest version of Asus ZenFone 6 international ROM (UL-ASUS_T00G-WW-10000.11.40.1-user.zip) Here or Here
4. Change the archive name ! ! ! Since Asus ROM upgrade can only recognizes WW-> WW, CN-> CN, TW-> TW, so we need to modify the version name is CN version and change the date to the date of the version number of the phone again subsequent date. The international version of the ROM to download the compressed package name "UL-ASUS_T00G-WW-10000.11.40.1-user.zip" Renamed as "UL-ASUS_T00G-CN-2014.5.1.65432-user" or  the phone will not recognize
5. copies modify the good name of the international version of ROM ZIP file to the root directory of phone memory ( that is placed directly under the root directory of the phone U disk , not on any folder ) , remember not to decompress ( picture to step demonstration, not International Edition ROM)
   
6. Copy is completed, disconnect the phone and the computer, the screen will be the upper left corner "!" Was detected in the system update file prompt, you can click on the order operation
   
   
7. Phone automatically reboot after the upgrade is completed and prompt updates
   
8. Welcome screen
   
   
   
   D.W.Y.O.R

Credit to : http://tieba.baidu.com/p/3026713565