SOMEBODY HELP

I have just received my Mi Box 3 "MDZ-16-AB" Android 8.0 Global Version After setting it up and initially finding no option to turn auto update off the box went and auto updated I do not know what the factory version was but it is still Android 8.0.0 after the update The build is OPR6.170623.013.2573

I was unable to test the passthrough options on kodi before the update but after trying a number of versions of kodi "18.5 and 18.0" and SPMC after the update there is no options under passthrough for the HD formats Has this been removed on the latest update? I thought I read when researching that HD passthrough worked on all 8.0 versions but was removed on 8.1?

Any help GREATLY appreciated