Hello Kelvintino! Thanks for reply!
My "brandnew MIMAX 2" had MIUI Global 8.5.2.0 out of the box and git OTA with updateroutine the Version MIUI Global 8.5.4.0 NDDMIED now.
Other ROMs in this Moment are not possible because I have the 72 hours-waiting time for unlock my MIMAX2. Really 8.2.12.0...