It means you've lost your MAC addresses and individual router calibrations. It's always a good idea to back up the stock partitions first before installing OpenWrt, now you know). You can still try restoring the MAC addresses manually later, or use a backup from one of your another routers.
Seems like you fully wiped out your NAND flash and didn’t restore the partitions after nand erase.force command.
Try connecting again using mtk_uartboot. If it connects, there's still hope for recovery (see details also here):
- download tftpd64.464.zip and unzip it;
- place all the required files into the unzipped tftpd64.464 folder: BL2.bin, FIP.bin, Nvram.bin, Bdata.bin, Factory.bin, openwrt-mediatek-filogic-xiaomi_mi-router-ax3000t-initramfs-kernel.bin
- repeat all the steps with
nand erase.forceandtftpboot+nand writecommands. Please make suretftpbootis indeed transferring files to the router and not blocked by firewall (read the terminal output in console).
Good luck with restoring your partitions!
Let us know how it goes. For further discussion and help requests, I suggest you create a separate topic + provide console outputs with your commands.