Fastboot, in Android phones, refers to a lower-level brush rescue mode than Recovery, also known as boot mode, line brush mode or Bootloader mode. Different from the recovery mode that mainly uses the interaction between the screen of the mobile phone and the physical buttons. In fastboot mode, it is necessary to connect the device to the PC through the data cable, and transmit various instructions to the device through the CUI command line or GUI graphical interface to realize the operation.
All kinds of instructions, fastboot mode is powerful and rich, and brushing to unlock is only the most commonly used operation. Press and hold the volume down+power on key to enter the shutdown state, and you can use adb command to restart to fast start.
Android device partition
Boot partition: contains the Linux kernel and the smallest root file system (loaded into RAM disk). It mounts the system partition and other partitions, and the boot is located in the system partition (runtime).
System partition: contains the system application and library of Android system, which is running normally. This partition is mounted read-only, and its contents only change during OTA update.
Vendor partition: it stores the private executable programs, libraries, system services and apps of the vendor, so this partition can be regarded as a supplement to the system partition, and some functions of the ROM customized by the vendor can be placed in this partition. During normal operation, the partition is loaded as read-only, and its contents are only changed during OTA update.
Userdata partition: it stores users' photos, movies, newsletters, applications installed by users and saved data. The OTA update process usually does not touch the partition.
Reference to the above content: Baidu Encyclopedia -—fastboot