Users can choose to flash only specific parts of the phone (like the recovery or the radio) instead of the whole OS.

In the world of smartphone repair and custom ROM enthusiasts, "Image Download Tool" is a staple. Unlike consumer software, this tool doesn't have a flashy UI or a marketing team; it is built for one purpose: communicating with a device's bootloader to write (or "flash") system images.

Usually, you must hold a specific button (like Volume Down) while plugging in the USB cable to trigger the flash.