Windows – Can’t pick up 5 GHz Wi-Fi any more (Qualcomm Atheros QCA9377 Wireless Network Adapter)

After reading this, here's roughly what I did:

• Uninstalled the Unknown USB device from Windows Device Manager (it was stating "Device descriptor request failed");

• Went to Asus official drivers website, downloaded the latest bluetooth drivers for my motherboard and installed them;

• Shutdown the computer, and "unplugged" the power for more than 30 seconds;

After powering it back on, windows had Bluetooth working again.

Keep in mind that I had reinstalled the Bluetooth drivers multiple times, always restarting the computer in between, and nothing changed. Only after unplugging the power did I actually manage to solve this issue.

This tells me that the underlying issue was hardware related, and depriving the motherboard from power reset the Bluetooth hardware to a good state.

Dual-band Routers that are listed as 802.11ac, can be assumed to be fully backwards compatible with 802.11 a/b/g/n.

That card supports wireless-n only over 2.4ghz. to get the advertised speeds for that card you may have to use it in 40mhz channel width mode. Also Some models support aggregating upper and lower channels in the 2.4ghz wireless-N modes for increased speeds.

The mode setting in the driver is to enable/disable the cards ability to negotiate wireless-n speeds.

Hope this helps.