How to enter Fastboot Mode KARBONN SMART A60 - Open and Exit Fastboot

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.
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