Holding the power button down does nothing. Your only option is to turn the screen off and unplug it.

Will the light go on the filter icon when it needs the filter changed in that state? Cause unplugging it for 30 or so seconds, is a real pain in the ass.

I should just reset it, while it's working, and keep it offline. Since the firmware or something is messed up.

I could replace the air purifier. But no idea what brand is better. I was looking at one, but the bad reviews are concerning. Oh and the filters might cost $69.