How to put HTC One (M8) in Fastboot Mode
1. Hi. Start by turning off the phone. To do that, press and hold the Power button.
2. Afterwards, press'n'hold 
3. You should release these two buttons after an Android image pops on screen.
4. Press the Volume button to navigate and Power button to choose in order to select Fastboot Mode.
5. Superb, you are now in Fastboot mode. Navigate this mode using Volume Keys; select options with Power button.
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