Make sure you are using a 64-bit version of Windows if you compiled it as such, and ensure you have all necessary libusb DLLs in the same folder.
Once the compilation finishes, you will find sunxi-fel.exe , fex2bin.exe , and the other utilities inside the directory. You can copy these binaries to a permanent folder (e.g., C:\sunxi-tools\ ) and add that folder to your environment variables to access them from anywhere. Method 2: Running Sunxi-Tools via WSL (Alternative) sunxi-tools windows
Most Allwinner boards have a specific button labeled "FEL" or "Recovery." Power off the board, hold the FEL button, connect the USB OTG cable to your PC, and then release the button. Make sure you are using a 64-bit version
USB FEL transfer speeds on Windows can sometimes be slower than on Linux. If you are writing a full OS image via FEL, be patient. Method 2: Running Sunxi-Tools via WSL (Alternative) Most