I have a problem when setting up a hotspot with an antenna that uses the chipset MT7612U (Alfa AWUS036ACM). I am using Mediatek Wireless Utility. I could change the frequency to 5 GHz and change the channel to reduce interferences. However, after doing some tests, now when I change to AP mode in Mediatek Wireless Utility I have the error "[ApCfg][Error] MTK_AP_Run() un-successfully err code=29". Moreover, despite in the application I could change the channel, the actual channel was not the one I selected and when I connect another device to this hotspot I realised that the radio type was 802.11n instead of 802.11ac.
How can I fix this problem? I tried to uninstall and install the software and the driver but i does not fix my error.