Fastboot is basically a diagnostic tool used to modify the Android file system from a computer when the smartphone is in bootloader mode. The commands are basic, and include, for example, to 'flash' (install) a boot image or a bootloader. You can start in recovery mode from the ADB commands. /
Accordingly, how do I get out of fastboot mode?
KEEP HOLDING THE POWER BUTTON UNTIL YOUR PHONES SWITCHES OFF OR PULL OUT THE BATTERY DIRECTLY(If Required) to exit the FAST BOOT MODE and then start your phone normally by pressing only the power button.
What is fastboot and recovery mode?
Recovery is the mode that is used by device to install updates to Android ROM partition. Fastboot on the other hand is a protocol that can be used to connect to the device from a computer over USB and issue updates to the partitions of the device. For example, while I'm in fastboot I can update by recovery partition.
What is the use of bootloader in Android?
A bootloader is a computer program that loads an operating system (OS) or runtime environment for the computer after completion of the self-tests. Bootloader is like BOIS to your computer. It is the first thing that runs when you boot up your Android device. It packages the instructions to boot operating system kernel.