Thank you for confirming that the stripped stock image allowed you to revert the Archer C6 v3 back to the stock firmware!
Upon the first OpenWRT install, the default logon is "root" with a blank password. If you are unable to login this way, you may try to perform an OpenWRT factory reset.
To do so, after the device is powered on and you are able to see the OpenWRT logon screen, press and hold the "Reset" button in the device for at least then seconds and release it. This should clear all OpenWRT settings and remove any previous password. More details in the OpenWRT wiki here.
I made a little bit of research and found that installing the package luci-ssl-nginx (instead of all others) allowed me to see the GUI but it didn't allow me to gain access due ¿main? faile damaged of XHR request timeout.
@dsouza I noticed the C6 V3 didn't make to the latest stable release of today.
Do you know if there is differences between C6 an A6 ? I heard A6 being Amazon exclusive clone of the C6. Are you aware of any differences ?
As far as I know they are the same device. I believe that flashing OpenWRT A6 v3 firmware on the C6 v3 could work, but I would not recommend it unless if you have an UART and skills to open the device and recover it via serial console (since it may brick your router).
Anyway, I am willing to try this during the weekend...
I just flashed 21.02.1 Archer A6 v3 image on an Archer C6 v3.2 device and as expected it is working.
I had to "force" a sysupgrade from OpenWRT snapshot since it detected it was a different device. But the upgrade went OK and everything is working fine (obviously it started showing "TP-Link Archer A6 v3" on the status page.
Notice however that I (forced) flashed from OpenWRT snapshot C6v3 to OpenWRT 21.02.1 A6v3 using squashfs-sysupgrade image and I can confirm this works fine. However if you are flashing from stock firmware I cannot say it would work applying the A6 v3 squashfs-factory on a C6 v3.2 device. I think it would work but I have not tested.
I have instaled the snapshot version from 3 weeks ago, but last week I have tryed to upgrade to the last snapshot, but after that it starts to boot loop. But I can´t have the TFTP working to install a new firmware. Can anyone help me how to unbrick it?
The TFTP Booting I don´t know how to acess this U-boot, I think that is using the serial, but I can´t find the pins on the board.
The second method of restarting 4 time before full boot, don´t work either.
What I discovered now, is the the Led sequence changes when I push the reset pin as son as the power led starts blinking, the it starts blinking fast and do not stops.
I have already tried with wireshar to see if have any attpempt of the board to connect any IP address, but no luck.
Setup a TFTP boot server with address 192.168.0.5.
While starting U-boot press '4' key to stop autoboot.
Copy the initramfs-kernel.bin to TFTP server folder, rename as test.bin
From u-boot command prompt run tftpboot followed by bootm.
Archer A6 V3 has recovery page activated if SPI booting from flash fails.
Recovery page can be activated by powercycling the router four times
before the boot process is complete.
Note: TFTP boot can be activated only from u-boot serial console.
Device recovery address: 192.168.0.1