Upgrade procedure described in the User Manual.
IMPORTANT:
Verify which Revision of KT-107 you are upgrading to ensure that you use the correct FW file. Using the wrong FW can cause the device to be unusable:
KT-107 Revision 00 does not contain an R # on the label on the rear of the unit and contains R: 0003 or lower on the label on the box.
KT-107 Revision 01 contains R: 01 or higher on the label on the rear of the unit and R: 0104 or higher on the rear of the unit and on the label on the box.
This firmware is NOT compatible with new KT-107 devices running Android 10 operating system - R: 0512 or higher on the rear of the unit and on the label on the box.
See details in the Release Notes