It’s not exactly easy but it is do-able if you have a compliant vacuum, order a pcb adapter and can boot a laptop into a recent Debian os to flash the firmware. Be careful what you say on the telegram group (I was banned for trying to buy a pcb instead of solder one).
I wish my Xiaomi X20+ was supported. I knew it wasn’t when I bought it, but the price/capability alignment made me go with a dumb "smart" vacuum. There hasn’t been an update in supported robots in almost 2 years, so I’m still holding out hope it will eventually be added when Dennis Giese gets bored and starts looking into stuff again ;)
