I have just updated my custom Device Handler in Post#32.
It works as well as the previous code for me (v1 Hub), but I have no way to test if it corrects the CRC16 issue which appeared with v2 Hub. The FGK-101 Device itself seems to be innocent, it is just that it answers differently now that the v2 Hub firmware is different from v1.
This same issue was encountered in January with an other Fibaro Device (FGMS Motion Sensor) and a fix was proposed by Duncan.
Hope this works as well for my FGK-101 custom handler.
Let me know.