All MTK Based Oppo Preloader & CDC Driver
The first and most important part is installing Preloader-&-CDC Driver for COM3.
It is very important that the computer is forced to install the mentioned "Preloader & CDC Driver".
This makes it possible the COM 3 Port to be reserved for the SP Flash Tools, so when we connect the Oppo Phone via USB to the computer or laptop, it is correctly addressed.
1st we have to force the PC to install a special driver that will make it possible to communicate directly to the phone on a specific port COM 3. The installation of the “Preloader and Gadget Serial COM3” Driver is explained in pictures. Inside the .Zip (How To Install Folder) We have placed detailed screenshots. "cdc-acm.inf " located in Driver Folder
1.) Completely shut down the phone (press Power until it goes OFF).
2.) Then press and keep pressed the Volume-Up Key and the Power Key, for several seconds, until it starts into Factory Mode, as shown on the screenshot. I saw only Chinese letters, so I’ve written the translation, just to have an idea. Do not jump into any section of it, just leave the phone like that.
3.) Then connect the USB cable to the computer. The PC will try to install a driver (most probably, it will not succeed). To help the process, we open Device Manager to display this on the picture, we double-click the problematic driver, and choose Update Driver. Then we point to the folder with the extracted driver, so it can install correctly.