Xiaomi ax3600 bricked

Hello everyone, this is my first message in the community, first, thanks you guys for all of your work!

@bouyhy1989, have you recovered your router?? You had almost done, check this if you didn't: https://forum.openwrt.org/t/tuto-openwrt-unofficial-redmi-ax6/111340#unbricking-the-ax6-with-a-windows-pc-and-no-uart-access-6.

My problem is different, I have an Redmi AX6 which, after one or two system upgrades with the stock firmwares or after an reset with the rear button of the device it got bricked.

So, I only have the TFTP recovery built-in option. I have serial output.
The u-boot looks fine but the problem is that the ethernet interfaces looks that they doesn´t work properly.

An image worth more that my no-native English words

And wireshark capture.

I had to change advanced options on Ethernet interface on windows PC, fixing the "Speed and duplex" to 10MB Half or full duplex both works and I can see the DHCP requests from router on the windows PC with Xiaomi recovery TFTP running on it. But the AX6 - AX3600 doesn´t catch the IP offered to him and process doesn't continue.

Any idea? Thanks anyway.
P.D.: I've read all of the forum about these subjects before write this message. Excuse me for my English mistakes.