Esto comentan en avforums:

I will list improvements that should be included in the next software update that I am aware of. This update will apply to the K321, K700, K720, XT910 (Including the varying model number)

Fixes:
Stuttering at 4K with certain sources
YouTube will not buffer at 4K

Improvements:
Media Player improvements
Startup speed improvements
UI improvements

Apps:
Amazon Prime Video (TBC)

Model Specific:

XT910 - Full HDR Support (TBC)

@very452001
This model does not have an ambient light sensor

It does have MEMC frame insertion

Not sure what the bandwidth requirements are for 4K YouTube content but will most likely be around 20mb possibly a bit more

The update mentioned above will happen. We are aiming for the End of April for this software but in reality it could end up being May or even June.

If anyone has any further questions please email service@hisense.co.uk because I can't actively monitor this page