For older devices: Press and hold simultaneously.

: Avoid low-quality third-party USB leads; connect directly to a rear motherboard USB port if using a desktop. 2. Configure the Android Device Power down the smartphone entirely.

The USB drivers are missing, the cable is faulty, or the device is not properly in Download Mode.

The flashing process will typically take , depending on the size of the firmware and the speed of your USB connection. During this time:

is a powerful, leaked internal tool used to flash official firmware (ROMs) onto Samsung smartphones and tablets. It is the primary method for updating software manually, unbricking "soft-bricked" devices, or restoring a phone to factory settings. DroidForums.net Key Components of a Full Firmware (ROM)