HTC Desire HD - the permanent root with [DEV] PERMROOT & eMMC write [INSTRUCTIONS]

A permanent root solution has been found for the HTC Desire HD. Detailled instruction are in the XDA-Developers post [DEV] PERMROOT & eMMC write [INSTRUCTIONS].

Desire HD - rooting and shutdown, restart and fastboot modes

The Desire HD has 3 modes when it comes to shutdown and startup :

• full shudown : it's the classical way of shutting down Android. All processes are killed and the caches are flushed. After a shutdown, there is a cold start which takes quite a lot of time : about 25s to get the htc logo with the djingle + 40s more to load Android and ask you to enter your PIN code + 25s more to register on the network.
  
  rooting : After a full shutdown, the temporary rooting needs to be done again, and any package that may have been disabled (see [GUIDE] Disabling Stock/System Apps) has to be disabled again.
• restart (reboot) : it's also a classical way to restart Android that takes approximately the same time the full shutdown process takes.
  
  rooting : After a reboot, the temporary rooting needs to be done again, and any package that may have been disabled (see [GUIDE] Disabling Stock/System Apps) has to be disabled again, like after a full shutdown.
• fastboot shutdown : this is a new shutdown mode introduced by HTC in its latests smartphones. It basicaly freeze everything (processes, cache, ...) in its state and then has just to unfreeze them to startup. The startup process is then very fast : less than 5s for the phone to ask you to enter your PIN code + 25s more to register on the network.
  
  rooting : After a fastboot shutdown, the temporary rooting that may exists before the fastboot still exists and does not need to be done again, and any package that may have been disabled (see [GUIDE] Disabling Stock/System Apps) is still disabled. By the way, any app that have been launched before the fastboot is still awake and available through a long press on the Home button.

The power-down screen look like :

The fastboot shudown mode has to be activated from the "Menu" -> "Settings" -> "Applications" -> "Fast boot" checkbox :

The restart option ask for a confirmation :

"setCPU for Root Users" saves the battery of your Android device

I've used setCPU for Root Users on my Nexus and now on my Desire HD to save battery : setCPU adjusts CPU speed to what is needed to perform the required tasks.

setCPU lets you adjust the lower and upper speed for your CPU. There's a "device selection" function in the menu that lets setCPU perform all the computing and suggest the appropriate values for your hardware. Here's a screenshot for the Desire HD.

The "Time in State" section from the "info" tab lists the time your phone has spent at different speeds. From the following screenshot, it appears the Desire HD CPU speed scales between 4 speeds from 245 MHz to 1024 MHz, spending most of its time between the upper and lower speed. The same screen on the Nexus One shows many different speeds, the Nexus spending most of its time on the lower speed (it naturally depends on how you use your Nexus).

As said in its name, setCPU for Root Users require root access.Rooting instructions can be found here :

• Nexus One - CyanogenMod For Nexus One V5.0.5.3 (03/23/2010)
• Desire HD Ace : how to temporary root - [GUIDE] Temp Root [VISIONary by PaulOBrien]

Head to setCPU for Root Users's official page to get more informations on setCPU, specially on how to use setCPU to overclock / underclock your CPU.

Scan the following QR-code to download setCPU from the Android Market.

Desire HD Ace : how to temporary root - [GUIDE] Temp Root [VISIONary by PaulOBrien]

Right now, there's no permanent rooting solution for the new HTC Desire HD (for UK).

But there's a temporary root solution provided by MoDaCo with the VISIONary app available on the Android Market.

HTC Desire HD (Ace)

Just receive my new Android phone : the HTC Desire HD (here in english HTC Desire HD).

Very nice phone.

But still not permanently rooted at the time of this writing.