Thanks for your reply. However I like to announce that the old tricks still work and BOOM still happening 3days ago. Mi Home Version 5.4.1.
My devices are all not supported in SG, for example AC companion, Zhirui light, and some Zigbee Aqara sensors. I started with The AC companion, it will only show up in CN server, after following the trick many times by switching the server to and fro, finally the SG server detected the AC device and installed with “fail to connect” error. Even though reported as failure, it shows 1 device connected, but ICON was invisible. I gave up, but on the next day when I turn on MiHome App, BOOM, all unsupported devices appeared on the add screen and I can see my A/C Icon connected.
I was so happy, I can control everything from SG server using MiHome App.
and I thought now I could linked to google Home, However, my dream crushed as devices still cannot be seen on google home app.
So the conclusion is, Even if I manage to make SG server to link to all unsupported CN devices, I still cannot get Google home to work with them, Google home just can’t see the unsupported devices.
Another announcement, yesterday 16Aug, the MiHome APP has a new revision update 5.4.5, After I did the update, the SG server BOOM again, all the unsupported devices disappear from my screen again. By now I am too lazy to retry the trick again to fool MiHome App. I am too tired, simply give up and start to use CN server without using google home voice control.
Just like to share the above experience for those who are in the same path…and it will save you a lot of trouble.