TP-Link Archer C6U recover original firmware

Hi, I have installed OpenWrt using the easy installation instructions from here:

OpenWrt works fine, the device is not bricked but I would like to revert back to the original TP-Link firmware.

Does anyone know if this router supports TFTP?
I have tried from a Windows laptop connected to the router through ethernet cable
-Configured to use static ip ,
-Disabled antivirus firewall temporarily
-Started Tftpd64
-Pressing reset button then restarting the router while holding rest button pressed for 5 seconds

I would expect at this point for something to show in the log viewer of Tftpd64 but nothing comes.
When I try to ping I get back:
Pinging with 32 bytes of data:
Reply from Destination host unreachable.
Reply from Destination host unreachable.
Reply from Destination host unreachable.
Reply from Destination host unreachable.

Ping statistics for
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Any other suggestions to how to re-install the original firmware and avoid bricking the device?

Thanks, serial would be a last resort for me as I don't have much experience with soldering, I was hoping there is an easier way to flash the original firmware through tftp, someone seems to have managed to do it for a C6 router at least:

C6 isn't C6U though, is it?

C6v3 is at least Mediatek, the others aren't.

Read the rest of the github entry.

From the 2 options in the github entry, the serial one seems to be less risky as to avoid bricking the device, or not?
Looking on the pages for both routers, they are listed with the same Mediatek version of CPU, switch and only a different version for Mediatek WLAN Hardware, do you mean something else?

It is, assuming you got the hw required to use it.

Just because the hw is identical, doesn't mean the sw is too.

But hey, knock yourself out, it's your device.

If anyone else is trying to revert to stock this router, I recovered it eventually by trying to flash from Luci (forced), that didn't work and all lights stayed lit. Then I changed my IP locally to and subnet mask then I could access the recovery page at I flashed the first version I could find on TP link website, then upgraded to the latest one from the TP-Link UI.

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