Fastboot mode
Fastboot is a protocol that can be used to re-flash partitions on your device. It is one of the tools that comes along with the Android SDK and is an alternative to the recovery mode for doing installations and updates and for unlocking the boot loader in some cases. While in fastboot, you can modify the filesystem images from a computer over a USB connection. Hence, it is one of the ways to install the recovery images and to just boot in some cases. Once the phone is booted into fastboot, you can flash image files to the internal memory. For example, the previously discussed custom recovery images such as TWRP recovery can be flashed in this manner.
All you need is to type a few commands. First, reboot the device into bootloader/fastboot ...
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