Unlocking or locking the bootloader (though this is restricted on most modern BlackBerry devices). Driver Installation Guide
If your PC doesn't recognize the phone while in Fastboot mode (it may show as "Android" with a yellow exclamation mark in Device Manager), follow these steps:
Windows power management turning off the USB port. Fix:
: An autoloader is a .bat (Windows) or .sh (Mac/Linux) script bundled with official firmware and a fastboot executable.
To get started, you'll need the official BlackBerry USB drivers and the Android SDK platform tools: