5Ghz WiFi on E2500 stopped working

I had my E2500 with 2.4 and 5Ghz WiFis with different names working fine for months until yesterday when 5Ghz WiFi stopped working and I had to switch my PC back to 2.4ghz. When I go to the router page -> Status -> Wireless Networks the 5Ghz network shows an empty MAC address, Channel as N/A and Channel Width as N/A, while 2.4 has them properly filled. I've tried using different settings for the WiFi, but nothing worked. I also tried resetting the device and updating the firmware. How do I know that the 5Ghz interface is not defective and figure out the cause of the problem?
Solved!
Go to Solution.

Ensure the FW was updated correctly:
To safely update FW, I recommend doing the following: Download the FW file from the support site first.
1. Save router config to file first using IE or FF with all security add-ons disabled.
2. Factory reset the router with all other devices disconnected or turned OFF accept for 1 wired PC.
3. Reload or Update the FW using IE or FF. Just download the FW file to your local wired LAN PC.
4. Factory reset the router and then set up from scratch first and test with out loading the saved config from file. Check to see if any problems are fixed before loading the saved config from file. Sometimes you need to set up from scratch with out loading the saved config file. Just safer that way.

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5Ghz WiFi on E2500 stopped working

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