Contact TP-Link support and see if that have a beta version firmware for this model to correct VPN.

Click either Use default account or Use New Account. Set folder sharing to share all. Save the settings. Power off the router, insert USB, and power on the router. Now see if you can access the USB...

My understanding that once a router is bricked, it is not a sure thing that it can be un-bricked. It depends on the router and what caused it to brick. Why would you have a need to replace the C9...

Shot in the dark... Check the reset button and see if it happens to be stuck. You should hear a click or fell it click when depressed. Do not hold it in long as that resets the router. Let us know if...

If it was me I would drop back to the previous version of the firmware if it was working. I had to do that with my C8 to get port forwarding to work.

Same as Why do people hate Fords or some other type of cars?