This guide makes your Xiaomi Mi 11 Ultra to run consistently at 90hz. This can be used to save battery vs 120hz and keep the smoooooooth animations vs 60hz.
1 – Change your current Screen Refresh rate to 120hz;
2 – Download from the link below:
SetEdit (Settings Database Editor)
3 – Open the App and find & edit the entries:
“peak_refresh_rate” from “120” to “90”;
“user_refresh_rate” from “120” to “90”.
4 – Close the app.
Disclaimer: Some users reported some green tint after some time using this. Use it at your own Risk!