fastboot:tldr:81a5d

The "fastboot getvar all" command is used in Android device software development and modification scenarios. It is typically run through the fastboot utility, which is a command-line tool used to communicate with an Android device when it is in fastboot mode.

When you execute the "fastboot getvar all" command, it retrieves detailed information about various variables from the connected Android device. This information is crucial for understanding and interacting with the device during the development or modification process.

The "getvar" command is used to retrieve specific variables, and "all" is a parameter specifying that all available variables should be returned. It gathers details about various aspects of the device, such as the bootloader version, device identifier (serial number), product model, firmware version, kernel version, secure boot status, and several other device-specific attributes.

This command helps developers and advanced users gather necessary information about the device during activities like flashing custom ROMs, unlocking the bootloader, or diagnosing issues with the device's software or hardware. It allows them to make informed decisions and execute further actions accordingly.