@lakotaubp
Hello Lakotaubp, thank you very much for your fast answer.
I did not know that flashing UT on another Gigaset phone is such a politicum. Me, I bought a Vollaphone via the Kickstarter campain and since a year now I work as a beta tester with many issues posted to get the Vollaphone work well with UT. But the vollaphone is still buggy with UT and I want to see UT on other (Gigaset-) devices, which meanwhile have a better hardware quality.

The Vollaphone is one of the supported devices for UT.
The Vollaphone is manufactured by Gigaset, a German company.
Would the UBPorts-installer install UT on another Gigaset phone, such as the GS4 as well?
The Gigaset GS4 seems to be very similar to the Vollaphone.