Flint GL-AX1800 - 5Ghz cannot connect

Hi everyone and sorry for my english. I recently bought the GL.INET GL-AX1800 FLINT router with OpenWRT on board. It has a problem, the 5G WiFi network is not detected by the mobile phone while the 2.4G network no problem. From the router settings the 5G is active but as I said before it is not detected by the mobile phone. How to solve the problem? Thank you

Is the 5ghz channel set to Auto? Try changing to 42 and see if that helps.

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Yes, it is set to Auto. Changing in 40, it works. Thanks for your help