hAP ac^2 Problems---Extremely Poor Performance found in 2.4G and 5G WiFi

Since the factory version is v6.40.5, I expected the bug fixed version of v6.40.7 should clean the bugs in the previous version. As seen in the following figure, the 5G WiFi results are terribly bad. The average speed is around 25Mbps, which is much below our expectation of 500Mbps for ac products. As a result, it is no point to test any bug fixed version of firmware until the official release v6.42.