The changelog has been revealed for the Firmware Version 188.8.131.52.386.25217 of ZenWiFi AX (XT8). According to the ASUS, the new update enhances the stability of the wireless connection. It also fixes the Kr00k vulnerability (also known as CVE-2019-15126).
The file size for the firmware update is 71.57 MB. You can download it manually with this link. After downloading, make sure the MD5 of the unzipped file matches the following: 2cbf3c6b7da6a9af88980300fdfca7fb.
ASUS ZenWiFi AX (XT8) was released earlier this year. You can see how the Tri-Band Mesh Wi-Fi System compares against the ASUS ZenWiFi AC (CT8) in our versus guide.