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i want to apologize because i think you get this question a lot, but i experience problems trying to root my HTC Sensation.

I turned USB Debugging ON, checked that Fast boot is turned ON in Settings > Power section and connected phone to PC.

USB Debugging turned on

My device was recognized successfully Device was recognized

Also it was shown in adb list

C:\sdk\platform-tools>adb.exe devices
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
List of devices attached
HT15LVXXXXXX    device

Now i took out my battery, inserted that back, pushed and hold Power button and Volume Down and voila, i am in HBOOT.

I pressed Power button once, choosing FASTBOOT FASTBOOT

My phone connected to Windows, but this time device was not recognized. Unknown Device

I tried to add drivers for that device manually, but it failed Failed drivers

I even tried to add %MyHTC%=HTCAND32.Dev, USB\UNKNOWN to androidusb.inf and then add driver manually, but device was not working anyway and fastboot devices command returned empty list.

I tried same operations on my Mac using fastboot-mac for that and i got same result as on Windows - device is not recognized in fastboot mode.

Any ideas?

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Well, two tips I can give you. 1) Fast boot in the settings has nothing to do with fastboot for flashing. The settings one is for not fully rebooting the OS to speed restarts. 2) The driver for fastboot is different than the driver for ADB. If you install HTC Sync it should install both, however. Sometimes you have to remove conflicting drivers using usbdeview or other tool. –  Lance Nanek Mar 3 '13 at 11:35
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