How to put HTC Desire 520 in Fastboot Mode
1. Press & hold the Power button to power down the phone.
2. Afterwards, press'n'hold 
3. You should release these two buttons after a Bootloader mode menu pops on screen.
4. Press the Volume button to navigate and Power button to choose in order to select Fastboot Mode.
5. 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 520How to Soft Reset HTC Desire 520How to put your HTC Desire 520 into Recovery ModeHow to change the language of menu in HTC Desire 520How to put HTC Desire 520 in Fastboot ModeHow to put HTC Desire 520 in Bootloader ModeHTC Desire 520 descriptionCheck IMEI and warrantyCheck BlackList statusUnlock HTC Desire 520