@tomcic81 Are there any secret steps? Or is it just necessary to install a compatible Vendor-image? Did you use the SP Flash Tool, or did you flash with fastboot?

The reason why I ask:
I have a GX290, and I'm wondering if I can get UT up and running on it. As far as I read, GX290 has different hardware: display, camera and battery differs compared to GS290.
But Gigaset provides the same Open Source Archive for both devices. I couldn't check the files, as the 14GB download did not finish so far.
But maybe both devices share the same kernel and vendor files.