I tried flashing Sailfish X to my Xperia X using this device.

My sim card was detected but I was unable to get any signal.

My only changes was using the F5121_34.3.A.0.238_1302-4806_R2D (DE T-MOBILE) from Xperia flashtool and my officially brought Xperia X image.

Anyway I was able to get signal by using the official Windows Sailfish X installation instructions and F5121_34.3.A.0.228 NOBA firmware from Emma.