I have tried several times to install the Openwrt build into mi router 3c but to no avail. Last time I was successful installing upto BREED bootloader but only to know that breed isn't compatible with Openwrt. I need a full flash dump of Openwrt installed mi 3c firmware if available.
Maybe Xiaomi 4C?
I am thinking about repurposing this router instead. I could buy a mi 4a but currently I don't need one. This one will be used as a backup router
You can try breed command： autoboot.command. I remember OpenWRT was a tutorial with Xiaomi router 3C.
4C flash breed ，It also does not work properly. Need use "autoboot.command" command.