Touchscreen doesn't work

hello, my beambox didn’t work anymore, after contacting reseller i had to install new update via reflash sd card. Did that and now want to restart the beambox, i get a warning (in chinese that i have to be aware of fire (thank god for google lens ;-)). So i want to agree with this pop up, but the touchscreen doesn’t work, so can’t proceed. And of course i need a job to be done.

As i understand, the beam box uses a raspberry pi under the hood. Those have a USB port that you could probably plug a mouse into.