Can’t watch UHD recordings on 360 Mini box

We have a 360 installation with a main box downstairs and a mini box upstairs. The mini box is connected to a 4K TV and can watch things like Disney Plus, Prime Video etc. in 4K.

I notice there is a Virgin 4K channel. I can watch it live fine from the mini box, but if I record a show I’m unable to play it back on the mini box. It says something like “The channel only lets you watch it on the box it was recorded on”. Since the mini box can’t record itself, and the main box is only connected to a 1080p TV, I’m unable to watch recordings from the 4K channel.

I would move the main box to the room with the 4K TV, but it’s a bedroom and I find the noise of the hard drive disturbing. Is there a way to watch these recordings in 4K from the Mini box?