Take a look at your router and see the model. Follow the instructions to see if your router and adapter even support this frequency. To do this, you will be required to do a bit of online research for your specific model. Method 1: Check if your router and wireless adapter support 5GHz wireless Keep in mind, however, that it is possible that you need to buy new hardware if for any reason you are dead set on using 5GHz. To solve this issue, there are a few things that you should do.