Had to go back to previous to see this!!!
Takes some time till it is shown, thats why I didnt see it before ...
found it now on taiwan/uk/de site but only under drivers & tools (not bios&firmware and not on /us at the moment):
https://www.asus.com/uk/Networking/RTAC68U/HelpDesk_Download/
Version 3.0.0.4.384.20624 2018/03/2642.7 MBytes
ASUS RT-AC68U Firmware version 3.0.0.4.384.20624
Suport multi-langue(UTF-8) network name*
Supported Let's encrypt to help get free Certificate Authority (CA). To enable this feature, the router needs to obtain public IP from ISP.
Security fixed
-Fixed information disclosure vulnerability. Thanks to Haitan Xiang and Fand Wang.
-Fixed CVE-2018-8826 remote code execution vulnerability. Thanks to Chris Wood.
-Fixed AiCloud 2.0 Reflected XSS Vulnerability. Thanks to Guy Arazi and Niv Levi contribution.
Thanks to Guy Arazi for following vulnerabilities.
-AiCloud 2.0 Stored XSS Share link manager.
-AiCloud 2.0 Reflected XSS - "share a link"
-Download Master HTTP service DoS vulnerability.
-Download Master Reflected XSS Main login.
Bug fixed
-Improved AiMesh stability.
-Improved system stability.
-Fixed DST related bugs.
-Fixed client list related bugs.
-Fixed traffic analyzer UI bugs.
* Windows XP and Windows 7 do not support UTF-8 format SSID. These two OS may see gibberish if using multi-language SSID.
Please unzip the firmware file first then check the MD5 code.
MD5:146ce34f70a34b26492ffdeb9c6dd3d2