Add OpenWrt support for Xiaomi "Redmi AX6000"

Hello people,

unfortunately I have read the other posts only now.
I was able to flash one AX6000 at the end of February without any problems.
Now the second one arrived and I wanted to equip it with OpenWrt as well.
Unfortunately I am stuck in bootloop.

The MiWifi Repair Tool does not help me here.
I started the tool in a Win11 VM, because Windows wants to block the tool as Ransomeware.
The tool itself also runs tremendously unstable as it crashes all the time.

How can I rescue the router?
Luckily I have a Raspberry Pi 3B+ with display here, which I can use to connect to the router via UART.
I can also see the bootloop via that.
I just have no idea how best to proceed now.

For the record, I followed the installation instructions and got as far as installing OpenWrt via stock layout. After the reboot I had the bootloop.
I would quite like to use ubootmod.


UPDATE:

Managed to recover the router after all.
I don't know if it was due to my attempts to reload the original firmware or install the squashfs-sysupgrade, but I was now able to boot OpenWrt again with some detours.
I had to let firmware1 start via UART first, this returns to bootloop, then start firmware0 which also returns to bootloop (u-boot) and then I could let default load and got back into OpenWrt.

Very strange, but the router was then responsive again.

After that I was able to install ubootmod successfully.
(Snapshot from 17 March 2023)
The router now starts without problems every time with OpenWrt.