I tested this device and sent it back after 4 hours of test.
I bought it because it was advertised with MPEG4:2:2 decoding. This feature works only on low symbol rates. symbol rates higher than 9000 make problems and cause a complete freeze of the device. The whole user interface is very unstable and support at GTMedia forum is very bad. Lots of software bugs and no solution provided. Also bad: the LNB power supply has not enough power to drive my USALS motor properly. Link to Android smartphone is also not working. Keep your hands away from this device.
I am also one of the victims of GTmedia GTX Combo. I found this forum while looking for solutions to my problems. I wish I had seen this message before purchasing.
There is no one answering questions neither on this forum nor on freesat.cn.