How to enter the fasboot mode? How to exit the fastboot? How to quit into normal mode? Fastboot is a protocol which may be used for updating the flash file system in your device. Using the fastboot you can modify the file system image from a comuter via USB connection. It may come in handy when you want to do a quick update of the firmware without having to use the recovery mode. Read more: http://www.hardreset.info/devices/zte/zte-blade-v62/