⚠️ Always use a genuine or known‑good USB data cable. Some cheap cables lack the data lines and will not work for flashing.

Click on the button and select the configuration file specific to the C3520 architecture.

Look at your computer's Device Manager. Under ports, you should see SAMSUNG Mobile USB Serial Port . Click in the Flash Loader interface.

: Verify that your micro-USB cable supports data transfer and is not a power-only charging cable. Safety and Disclaimer

Remove the battery for 5 seconds, then reinsert it.

Browse and select the Main and CSC partition files within the loader interface. Connection (Bootloader Mode):

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Verify the setup configuration matches the specific C3520 hardware profile. Corrupted or incomplete firmware download package.

A Windows PC (Windows 7, 10, or 11 running in compatibility mode if necessary).

: The codename and build number imply a specific iteration of the software, likely with its own set of changes or improvements.

keys while connecting via micro-USB—to initiate the flashing sequence.

Double-check that all paths point correctly to your extracted firmware directory. Step 4: Establish the Boot Connection

The software should detect the phone and begin the "Write" process automatically.