Fast boot is pre boot environment of android OS that starts before android itself does. to access fastboot press and hold volume down and power button for 5 seconds. release power button while continuing to hold the volume down button for another 3 seconds.
Fastboot mode helps to modify or write data directly to your phone's flash memory. Fastboot mode even provides you access to your device's partitions, the data partition, and the boot partition. Simply, fastboot mode gives you the right to modify certain parts of your phone's essential files.
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