1. Install USBDeview and use it to uninstall all Vcom, Mediatek and Preloader drivers
1b. Extract the contents of the Mediatek USB VCOM file above ( The Password when extracting is Hovatek )
2. In Windows, go to Control Panel and open Device Manager
3. Click any of the device groups (any of the items on the list) you see there, then from Action menu, select Add legacy hardware
4. Add hardware wizard will be opened, click next
5. Select Install the hardware that I manually select from a list (Advanced)
6. Click next two times and click Have Disk button
7. Click browse and find where your driver's .inf file is, then select it (the .inf you'll select is located in drivers > USB Vcom driver > your OS) . Ensure to select the 64 bit .inf if your PC is 64 bit
8. Click Open and OK. You will see the drivers listed.
9. Select your driver there (select Mediatek Preloader USB VCOM Port)
10. Click Next and finish installing
11. If SP flash tool or other software still dont detect your phone then also install Mediatek DA VCOM (consider installing more from the list of drivers one at a time if need be )