OpenWrt support for Xiaomi AX3000T

Hello. I bought router v 1.0.31 (INT).
Successfully flashed step by step openwrt by ssh exploit metod (no u-boot). By the way i could forget step 6:
Add nvram settings into /etc/rc.local file:

sed -i '/exit 0/i sleep 5\nfw_setenv flag_try_sys1_failed 0' /etc/rc.local

Everything was ok. I could successfully ssh to 192.168.1.1
Today i've forced the same problem as other people with bricked devices. Router doesn't give any ip address from dhcp to my host and i can't reach him to addresss 192.168.1.1 by ssh (no ping). I saw later then only 6 reboots are avaible.
I have backup bin files from step 2 (Bdata, BL2, Factory, FIP, KF, Nvram, ubi).
I have UART cable also.
I read some manuals here, like this:
Assume that you have installed OpenWrt with stock layout, with original u-boot:

  • Connect to router via UART

  • Select Load Image in the u-boot

  • Set start address to 0x48000000, then set TFTP parameters to load the initramfs-kernel.bin.

  • Start the loaded kernel, then perform sysupgrade on OpenWrt.
    or how to connect via UART cable and putty.

But i still can't understand how to restore router properly. Don't see anything about these bin files (Bdata, BL2, Factory, FIP, KF, Nvram, ubi), whose i backuped.
Can someone help me with simple 1,2,3 steps v 1.0.31 (INT) stock openwrt firmware?
Thanks