Finally I was received the US version RT-AC86U.
So here is my short review about the US-version RT-AC86U. The most importantly, you may eager to know that will this router works in Malaysia too? Then answer is, YES!
I'm not so sure since Asus which version of firmware updates, Asus was removed the region settings in the Wireless > Professional. Last time when I bought my China set RT-AC86U from China, this router was able to set to Asia, US, Europe and Australia. Unfortunately, probably Asus new firmware updates were removed the "region" option from wireless settings. Both of my main router and this US-router does not found this setting anymore.
My purpose to buy this router is just for aimesh. However, since my curiosity to ask myself whether this router (US version) works for TM Unifi too?
I can find out Unifi and Maxis under the IPTV option in this router (don't have TIME)

The US version got multilanguages.

US version get connected and working fine on TM Unifi

This router comes with the Chinese Koolshare Merlin 384.13_1. I can easily flash back to Asus official firmware. Everything working fine and internet get connected to the internet.

Speedtest on Wifi, not bad.

I also can flash to any third party custom firmware, either merlin or the Chinese Koolshare.

