Use the Octopus Box (paid hardware/software) or Z3X Samsung Tool (paid) for guaranteed results.
Before starting, ensure you have a standard micro-USB cable and a Windows PC. samsung gt-c3520 flash file and tool
To flash the Samsung GT-C3520 , you will primarily need the Flash Loader 7.5.4 tool and the appropriate firmware files Use the Octopus Box (paid hardware/software) or Z3X
Search on GSM-Forum or GSM-Hosting for:
If the phone remains unresponsive after multiple attempts: samsung gt-c3520 flash file and tool