Maybe you are locked in a pstore recovery like me.
In this case uboot always boots to recovery.
if there are files in the /sys/fs/pstore directory remove them then reboot.
rm -f /sys/fs/pstore/*
This turned out to be the problem for me OpenWrt support for Xiaomi AX3000T - #2171 by gssjshark
I was able to go back to 23.05.5 and opkg was working normally. Thanks for your help though
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Yeah, soon there will be a lot of posts about why "opkg update" or "opkg install luci" do not work after installing official Snapshot image on the AX3000T.
So, 
for those who are not aware yet:
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This works great on my AN8855+Winbond device, thank you!
Is there anyway to add 6in4 to these builds?
I've tried installing it from opkg but getting kernel version mismatch error, I'm guessing due to new snapshot release making older versions invalid.
Built a new one just now and also added it into the image.
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Just used the sysupgrade on the new version and setup IPv6 tunnel, all works perfectly, thank you.
I checked the pins twice. I'm using a Sipeed SLogic with 4 UARTs available. None of them worked, even though they all support 3.3V. I'm starting to think this is an issue with the router itself.
Have you tried the cpu debrick tool? I believe my bricked router also gave me no output at all, but just because the software didn't want to.
Also i somehow killed the uart of my raspberry, that gave me just garbage.
An oscilloscope or logic analyzer may help to get a complete picture of the current state of the router's UART connection. But it may not help to unbrick the router.
For example, I have a device with corrupted transmission (output), but I can send command (receiver is ok)
Have you tried the mtk_uartboot method, maybe receiver can still work?
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