Simply save the STB Emu apk to a USB, plug the USB stick into the mag410 and search for the apk via MagicFile and install it! Yes, STB Emu with mag410 works great ;o)

I don't know where to enter the url address for a portal... With the IPTV Set-top boxes like Mag250 you could enter the url address under Services and then Portal. Now the question is where to enter the url address for the UHD Set -top -Box Mag410 ? And whether it is possible to watch IPTV at all?

What exactly is the question? What exactly is not working? You need to provide more information if you want to be helped. It is best to first find out about the product and IPTV, read the instructions and what you actually need. Otherwise it will be difficult to give you a suitable answer.