: Ensure the phone has sufficient charge to prevent it from turning off mid-process, which can "brick" the device. : Verify that Samsung USB drivers are installed on your PC so the tool can detect the phone. samsung.com Troubleshooting If the phone is simply locked or frozen, you might try a hard reset or default codes ( ) before resorting to a full flash. or help with USB driver installation C3520 Flash Loader 7.5.4.20csc 20v0.2 Citrus Lite Zip