Press and hold the and 3 keys (or sometimes 1 and 2, depending on the specific version) on the keypad.
Since these files are often buried in old forums or hosted on unreliable sites, here is a solid, clean post you can use to request it or share it if you’ve found a working link: Press and hold the and 3 keys (or
installed on your PC to ensure the device is recognized. here is a solid
The is a specialized software tool used to reflash or update the firmware of the Samsung GT-C3520 (Citrus) Press and hold the and 3 keys (or
: Run bfloader.exe as an administrator from your extracted folder.