If it can't detect the 5Ghz wifi signals, then maybe your phone doesn't support it. Search for the specs of your phone and look if it has 5Ghz support or not.
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Unfortunately, Galaxy A12 is not 5g ready that's why it can't detect any 5G wifi. Apologies for any inconvenience caused. Still, thank you for your unwavering support for Samsung! Keep safe always. 😊
