How to put HTC Desire 620 in Fastboot Mode
1. Press & hold the Power button to power down the phone.
2. Afterwards, press'n'hold 
3. Press the Volume button to navigate and Power button to choose in order to select Fastboot Mode.
4. Fasboot Mode has started. It can be navigated with Volume Keys (movement) and Power button (selecting).
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Device MenuHard Reset for HTC Desire 620How to Soft Reset HTC Desire 620How to put your HTC Desire 620 into Recovery ModeHow to change the language of menu in HTC Desire 620How to put HTC Desire 620 in Fastboot ModeHow to put HTC Desire 620 in Bootloader ModeHTC Desire 620 descriptionCheck IMEI and warrantyCheck BlackList statusUnlock HTC Desire 620