OpenWrt support for Xiaomi AX3000T

By the way, it sounds like you have a standard partition layout,
and no modifications have been made to it.

I would recommend the following:

  1. Use the bootloader (FIP, mt7981_ax3000t_an8855-fip-fixed-parts-multi-layout.bin) I mentioned earlier.
  2. Boot it into recovery mode and simply flash the openwrt-mediatek-filogic-xiaomi_mi-router-ax3000t-squashfs-sysupgrade.bin file through its web interface.

What you'll get: a working OpenWrt.
What you won't get: U-Boot.