1. Download the latest International firmware (ending with WW) for your respective Zenfone 5 model. Eg: TOOF_WW is for 2Ghz 2GB and TOOJ_WW is for the 1.6Ghz 1GB model. 
2. Take note the date of existing firmware in the phone (Settings->About->Software Information). Eg: 20140430 for V0430 firmware.
3. Extract the -user.zip file from the downloaded _user.zip file.
4. Rename the -user.zip file to UL-ASUS_T00F-CN-yyyy.mm.dd.65432-user.zip where yyyy.mm.dd is any date newer than the existing firmware. If yours is an original Taiwan firmware, replace CN with TW. 65432 is just an arbitrary no, u can use 12345 instead.
5. Connect phone to PC. Copy the renamed -user.zip file to the root directory of the phone's Internal Storage.
6. Disconnect phone from PC.
7. There's an exclamation mark notification on the notification panel. Pull down and click to update.
8. Firmware update complete.

sure,

ZF5 Black High Spec

just wondering why so complicated and not just press OTA in one button?

well, well...you got yourself a black high spec...congrats bro.

well, well...you got yourself a black high spec...congrats bro.

that is not just a firmware update, its to change our ZF5 firmware from taiwan version to international version

but other than some changes in the apps, is it really better? i mean does it fix all the current issues of the ZF5?

yupe, once of the few last units from directd's first batch B4 they bumped the price up RM100 

The manual update for Wat? Can make it better?

My only quip with this model is the lack of a notification LED. There's a LED on the top right but it only functions as a charging LED.

What issue is that? The only issue i've encountered with V0430 firmware is that the double tapping of the volume button sometimes do not bring up the camera app from standby.

Nope, this manual update to international WW ROM is mainly for China models. The reason being China Asus Zenfone has no Google service support => No Google Play Store, Gmail, GSync, etc. Manually installing Google Play Store.apk is also useless as the app cannot even run! In addition, u will also get tons of chinese bloat wares pre-installed into the phone, constantly spamming u with notifications on the notification bar.

As such, the only way around this is to flash it with the WW ROM.

I see, u using China version of zf5?

I'm not sure if it's a combination of what I did, but I've used the "Notification Light Widget by Motorola for the Moto G problem, and then used Light Manager - LED Set to customise the LED notifications. Works fine on mine as initially mine is same as yours, LED only lights up during charging. Downside is that there's only 3 colours with the Asus, red/orange/green. Not much customisation can be done.
I'm not sure how it works before that, since I just updated immediately after getting the phone, but, for me, double tapping volume button then press the "on" button it'll go into camera app from lockscreen. Pretty useful for me since I'm using screen lock pattern and the camera app shortcut on the lock screen wouldn't function.

On a side note, I'm just curious what are the pre-installed apps on the WW version. There's a couple of apps I would wished I could at least disable on the TW ROM.

Yes, mine's a China version of ZF5. Imagine the disappointment and shock i had when i discover no google services!

U bought from taobao?any different with Taiwan set?

mine both sims' slot are spring loaded as well.