Select the flash file you downloaded earlier using the Odin tool.

A flash file, also known as a firmware or ROM, is a type of software that is used to control the functionality of a mobile device. It's essentially the operating system of the device, and it determines how the device behaves and what features are available. Flashing a device with a new firmware can help fix issues, add new features, or even change the language of the device.

Restart your device and follow the on-screen instructions to complete the setup process.

Click the "Start" button to begin the flashing process.

Press and hold the Volume Down, Power, and Home buttons simultaneously to put your device in download mode.

Please note that flashing a device with a new firmware can potentially brick the device. It's essential to follow the instructions carefully and use the correct flash file and tool to avoid any issues. Additionally, make sure to back up your data before flashing your device.

Flashing the Samsung GT-C3520 with a new firmware can help fix issues, add new features, or change the language of the device. However, it's essential to use the correct flash file and tool to avoid any issues. By following the guide provided in this article, you should be able to find and use the Samsung GT-C3520 flash file and tool successfully.