How to put HTC Desire Z 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 ZHow to Soft Reset HTC Desire ZHow to put your HTC Desire Z into Recovery ModeHow to change the language of menu in HTC Desire ZHow to put HTC Desire Z in Fastboot ModeHow to put HTC Desire Z in Bootloader ModeHTC Desire Z descriptionCheck IMEI and warrantyCheck BlackList statusUnlock HTC Desire Z