HTC One: How to enter Bootloader (or Recovery)
This video shows you how to get into Bootloader for Fastboot mode or Recovery mode (ClockworkMod Recovery) on the HTC One (actually the HTC 802w, the Chinese model). The device has been rooted, and Google Play Store and ClockworkMod recovery were installed. Fastboot mode allows flashing via USB connection from your computer. Recovery mode (ClockworkMod recovery) allows flashing from internal or external microSD card without USB connection nor computer needed (all flashing software self-contained on phone in ClockworkMod module). For HTC mobile phones, the bootloader is also called HBOOT. Rooting is like jailbreaking in Android world. If your phone is rooted, then you have superuser permission to modify (and hence install) anything on the phone.