TP-Link Archer C5 v1.20 bricked -tftp working

I have problem.. I have tl Archer c5 v1.2 witch openwrt v (I think) It works very fine, but I wan't to install open vpn server from this:

unfortunately this describe install on openwrt v OpenWrt 21.02 , and some errors are appeared.
I decided to upgrade openwrt to v21.02.3 and something went wrong.
Typically bootloop, but I can send file by tftp but... I try everyone file with .bin and no result.
I try: original tp-link firmware new/old version, openwrt 19 and 21 version kernel, factory and sysupgrade and nothing...
Is any hope in this case??

if you can't make the tftp work, then you'll need a serial connection.

Is there a small chance that this will be working??
As I wrote up, file was sent succesfully by tftp, but there is no resoult..

The working TFTP indicates an intact u-boot, and that's enough to get the device up and running again.

You might however, accidentally, have wiped the ART partition, if that's the case, you'll need a copy of it from someone with the same device. Without it, the wireless won't work properly.
Harder, but still very doable ...