Search for a "Full Flash File" or "Repair Firmware" . It usually contains 3-4 files:
Here is the detailed information regarding the flash file (firmware) and the required tool. samsung gt-c3520 flash file and tool
Select the configuration file (often a .mdl or .cfg file) provided inside the Flash Loader or firmware directory to configure the tool for the GT-C3520 platform. Check the appropriate boxes for the firmware files: Browse and select the Main Firmware binary file ( .bin ). Search for a "Full Flash File" or "Repair Firmware"
Verify you are holding the correct boot key combination while plugging in the cable. samsung gt-c3520 flash file and tool