USB connection instability or a missing Samsung USB driver. Solution: Install Samsung USB Driver for Mobile Phones manually. Use a USB 2.0 port, not USB 3.0 (Blue ports), as they are more stable for firmware flashing.
In the quiet hours of a rainy Tuesday, sat at his kitchen table, staring blankly at the glowing screen of his Samsung Galaxy. Just hours ago, he had changed his lock screen pattern in a burst of productivity, convinced he’d never forget it 4ukey for samsung