Router in question has at least 4 versions of firmware. Chinese, US, UN (for countries that don't have retarded policy) and Canada. I have Canadian version of firmware. I tried all modified firmware for the router I could find, but it always results in it being locked out:
Error code: 18005
Upgrade unsuccessfully because the version of the upgraded file was incorrect. Please check the file name.
Here is all the router information I have:
Name on the box:TL-WR940
Name on device: TL-WR940(CA) V3.0
Alternative name for device derived from FCCID (I hope): TL-WR941NDV6.0
Default firmware information:
Firmware Version: 3.16.9 Build 160408 Rel.41381n
Hardware Version: WR940N v3 00000000
Only available Canadian firmware: http://static.tp-link.com/TL-WR940N(CA)_V5_161121.rar
As you can see CA firmware implies that device is somehow v5 (?!?!), not v3 and not v6. What the....
Attempted firmware (loaded from web interface):
LEDE: ar71xx/generic/lede-17.01.1-ar71xx-generic-tl-wr941nd-v6-squashfs-factory.bin, tl-wr941nd-v5-squashfs-factory.bin
Other firmware: moded US versions of dd-wrt and open-wrt for TL-WR941NDv6 (AR71xx) produced between Aug 2016-now.
In other words I have no idea which firmware to try now or how to modify existing Canadian firmware. I was about to try to use TFTP methods, but I am not sure how big CA version of bootloader is or how to find out. It has been years since I flashed anything directly, so I would rather know exactly what I am doing before attempting.