It is a diagnostic protocol utilized on Android devices. It allows direct communication between a computer and the device’s bootloader, enabling modifications to the system at a fundamental level. For instance, users can employ it to flash custom recoveries, update firmware, or unlock the bootloader.
This mode offers significant advantages for developers and experienced users. It facilitates device recovery from software malfunctions and opens possibilities for advanced customization beyond the standard operating system. Its existence provides a low-level interface, crucial for troubleshooting and experimenting with Android’s core software components. Historically, it emerged as a replacement for earlier debugging and flashing methods, offering a more standardized and secure approach.