- Find .pac file for specific device online.
Example:
C21Y.pac
-
Open Research Download.exe >> Load Packet (gear icon) >> Select .pac file
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Turn off the phone >> hold volume down (-) >> Connect the a computer.
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Inside the program, Press Start Downloading (play icon) to start. Wait for about 30 seconds to finish.
- You have to disable driver signature enforcement in Windows 10/11