already disable smart connect option still can't find my 5g network

hi there 5Ghz Network band is not showing on all Mobile device or laptop (5 mobile) my mobile devices others neighbourhood router 5g band show but not mine......

Yes, I have already used this method. Now my router is running on the OpenWRT interface, but I want to switch it back to TP-Link's firmware, which is not working. Kindly tell me how I can revert it...

@Joseph-TP purchase on January 2024 but not use now i want to use and this happened and now i m not in france

@woozle

WiFI Router Archer C6 AC1200 and it doesn't work. I bought it from a trusted electronic shop in France. Let me explain. Only the Power LED is on. The other LEDs turn on for half a second when turned...