Standard firmware packages such as C3520XXLD1_OXELD1 or C3520XXKJ7_OXAKJ4
If the phone is simply locked, try the default Samsung codes Hardware Diagnostics: Use the code
Once the drivers are ready, launch the flash tool and get everything in place. c3520 flash loader 75 4 csc v02 citrus 218l link
Finding the correct files is the biggest challenge. While the original links from old tutorials may be dead, these active resources are excellent starting points:
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Once downloaded, extract all the files from their archives (using a program like WinRAR or 7-Zip) into a single, easy-to-find folder on your computer.
This points to a driver issue. Reinstall the Samsung USB drivers, try a different USB port (preferably a rear USB 2.0 port on a desktop PC), or replace the Micro-USB cable. This points to a driver issue
If you hit any road blocks during your repair process, let me know: