really a wild problem. not dare for a year. my tablet samsung galaxy tab s2 sm-t719 does not connect to my RC from inspire 2

Hi Lavashvili, have you tried other mobile devices to make a brief troubleshooting?  For Android mobile device, please turn on "USB debugging." For Samsung devices, please ensure that the connection mode is set to Media (MTP) Camera (PTP) Mode. Besides, please try different USB cable, if the issue persists, there may be compatibility issue, we recommend to use the mobile device in our compatible list.