AX3000T Bricked

[lolo1]

Hello!!
Well finally I managed to recover my router.
With the method:

OpenWrt support for Xiaomi AX3000T

Xiaomi AX3000T RD23 (Global version): OpenWrt installation guide for installing OpenWrt on the Xiaomi AX3000T RD23 (Global Version). installation method: UART flash. ** the following OpenWrt installation method requires opening the device, connecting a UART cable, and following a specific set of steps. This process is recommended only for advanced users, and may soft-brick your device. Please do not forget to make a backup of original router partitions before performing any actions …

then I was on this page:

OpenWrt support for Xiaomi AX3000T

AX3000T: https://www.mi.com/xiaomi-ax3000t

Inside AX3000T

[ax3000t_plate] VCC: 3.3V Baud: 115200 8n1 Inside WR30U: <a href="https://www.acwifi.net/23700.html" rel="noopener nofollow ugc">https://www.acwifi.net/23700.html</a>

UART

<a class="lightbox" href="https://forum.openwrt.org/uploads/default/original/3X/0/f/0f65a7f029859293d4ca885d30d0038d5219b567.jpeg" data-download-href="https://forum.openwrt.org/uploads/default/0f65a7f02985929…

OpenWRT images:
official images: snapshot 1.6k
remittor's builds: 23.05.X 1.0k
dimfish'es builds: snapshot 429
ImmortalWRT: snapshot 315
X-WRT: 24.01 655

I clicked on remittor's builds: 23.05.X 1.
and I downloaded
openwrt-23.05.3-240325-xiaomi_mi-router-ax3000t-sysupgrade.bin
Then I flashed this file and my router is ok.

I have started configuring my router and I would like to know how to make a backup of my configuration
by creating a .bin file to re-flash it if I had a problem.
THANKS!