For MTK : Turn off the phone. Hold Volume Up + Volume Down and connect the USB cable.
Z3X MST Tool V26.14 UPD: The Ultimate Guide to Samsung Smart Switch and Data Migration z3x mst tool v2614 upd
A: Yes, the installer is full. You do not need intermediate versions. For MTK : Turn off the phone
To use the Z3X MST Tool v2.6.1.4, follow the standard Z3X installation guide : z3x mst tool v2614 upd