[AT&T HTC One (M8)] liquidaluminum:
I created a detailed set of step by step instructions for unlocking and rooting the HTC One (M8). This process will work for other HTC models as well, however, obviously I have not tested every phone, and as I have just upgraded to the M8, this process will apply directly to it. I apologize in advance if this steps on anyone's toes, as I will be including download links for specific tools needed. These steps can be found in different threads and guides, but I had not seen one that detailed the entire process from start to finish. Basically, I wrote it in layman's terms so that I was easily able to understand the process. Hopefully this will help anyone having any sort of issues. If anyone feels that this guide is inappropriate, please feel free to delete it, as this is my first "how to"

- Unlocking your AT&T HTC One (M8)​

The first thing you will need to do is create a folder labeled "Android". Different guides recommend that you place it on your desktop for easy reference, however, it can actually be placed wherever you wish, as long as you feel confident in navigating to the folder via a command prompt or terminal. For my purposes, I host the folder on my D:\ drive. If you are unable to navigate folders using a command prompt or terminal, Windows 7 and Windows 8 will allow you to right click on a folder and open a command prompt that way.

Downloading the necessary drivers - Drivers can be found by following the link found here:

http://xdaforums.com/showthread.php?t=2019615

CNexus was nice enough to point out that HTC Sync is a lot of bloatware and not required, but can be downloaded if you wish. I opted to download the drivers only. This is a matter of personal preference for me. If you wish to install HTC Sync, then by all means do so.

You will also need to download the ADB/Fastboot files for Windows which can be found here:

ADB/Fastboot files for Windows: https://dl.dropboxusercontent.com/u/1360819/adb-windows.zip

01. Determine if your system is 32-bit or 64-bit and follow the installation instructions for the appropriate software/drivers.

(If drivers have already been installed, then skip this installation step and start with the next).

02. Extract the contents of adb-windows.zip to your "Android" folder.

03. Open a command prompt in, or use a command prompt to browse to the "Android" folder you previously created.

04. On your HTC One (M8) go to Settings > Power, and then uncheck the "Fast Boot" option.

05. Once step 4 is completed, switch your device OFF.

06. Now that the device is powered down, Press the Volume Down and the Power buttons simultaneously to boot the HTC One (M8) into "HBOOT" mode.

07. Using the Volume buttons, navigate to the "Fastboot" option and select it using the Power button.

08. Connect your HTC One (M8) to your PC.

09. On the command prompt you previously opened in step 2, type in the following command "fastboot devices" (do not include the quotation marks).

**At this point, if all steps have been followed properly, you should receive a message in the command window similar to the following:

C:\Users\XXX\Desktop\Android>fastboot devices 011aa0a1a01aaaa1 fastboot

10. Now we will need to go to the HTC Developer website to get an "Identifier Token" before the bootloader can be unlocked. The URL to the HTC Developer website is www.htcdev.com. If you do not already have an account, you will need to register and sign in before you're able to proceed.

11. Once your account has been created and you are logged in, click on the "Development Center" link at the top of the screen.

12. Under the "Unlock Bootloader" option in the center of the page, click on "Get Started".

13. Next, under "Supported Devices" click on "Select your Device" and find the HTC One (M8) and then select "Begin Unlock Bootloader". (This process works for several other HTC devices as well).

14. Accept all warnings and agreements and keep proceeding forward by clicking the "Next" button. When you reach step 8 on the site, enter the following command in the command prompt:

"fastboot oem get_identifier_token" (without the quotation marks).

15. Copy the message seen in the command prompt to notepad or your clipboard.

16. ONLY KEEP THE RANDOM SERIES OF ALPHANUMERICS FROM THE OUTPUT YOU JUST COPIED. Remove everything else such as <<<, (bootloader), Info, or any other piece of text. DO NOT EDIT THE IDENTIFIER TOKEN START OR END LINE!!!

Example:

<<<< Identifier Token Start >>>>

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A1A

<<<<< Identifier Token End >>>>>

17. Paste the edited output inside the "My Device Identifier Token" box on the HTC Developer website and press "Submit". Once you have submitted the identifier token, you will receive your unlock code binary file via email.

18. Upon receiving the "unlock_code.bin" file from HTC (this file is specific to your phone), transfer the file to your "Android" folder that was previously created at the start of this document.

19. With your command prompt still open, enter the following command:

"fastboot flash unlocktoken Unlock_code.bin" (without the quotation marks).

20. After entering this command, a message should appear on your HTC One (M8) screen asking if you really want to unlock the bootloader. Use the Volume key to highlight the YES option and press the Power button to select it.

21. At this point your phone's bootloader will be unlocked and it will restart automatically. The first boot could potentially take some time. If this happens, it is normal. Be patient and wait for the reboot.

22. After your device reboots, any previous settings that you may have saved will be lost with the unlocking of the bootloader. Be prepared for this, as you will need to redo them all. If it is your intention to unlock your bootloader, I highly suggest doing it on a fresh ROM install, so you only have to deal with it once. This means that "fastboot" will be re-enabled in the power settings. If you wish to continue to rooting your device, you will need to go to Settings > Power and un-check the "fastboot" option before proceeding.

- ROOTING YOUR DEVICE

​

The first thing you will need to do to root your device is to download the following files

TWRP Recovery for the AT&T (M8): http://androidfiles.org/getdownload.php?file=M8/Recoveries/openrecovery-twrp-2.7.0.4-m8_ul_ca.img

SuperSU: download.chainfire.eu/396/SuperSU/UPDATE-SuperSU-v1.94.zip?retrieve_file=1

1. Once downloaded it is advised to rename the TWRP Recovery file to either "twrp.img" or "m8recovery.img". (I renamed mine to m8recovery).

2. Once renamed, copy TWRP image file into your previously created "Android" folder.

3. Open a command prompt and browse to the same "Android" folder where you placed the adb/fastboot and TWRP Recovery files.

4. Make sure your HTC One (M8) is powered off. Boot the phone into fastboot mode by pressing the Volume down and Power buttons at the same time. Once booted, select "fastboot" by pressing the Power button.

5. Connect the HTC One (M8) to your PC.

6. Enter "fastboot devices" (without the quotation marks) in the command prompt to verify that the device has been detected by your PC. If the device is connected you should receive a message similar to the following:

C:\Users\XXX\Desktop\Android>fastbootdevices

010AA1A0A10AAAA1 fastboot

7. Once verified, type "fastboot flash recovery m8recovery.img" (or whatever you renamed your .img file to and without the quotation marks) in the command prompt and wait for fastboot to flash the TWRP Recovery on your HTC One (M8).

8. After TWRP Recovery has been successfully flashed, the device needs to be restarted manually. To do so, enter the command "fastboot reboot" (without the quotation marks).

9. Upon reboot, transfer the SuperSU zip file to the root directory of your HTC One (M8) via your PC.

10. Turn off your HTC One (M8) and reboot into Bootloader mode by holding the Volume Down and the Power button at the same time.

11. Navigate to the "Recovery" option and select it by pressing the power button. (After following this step, TWRP will load on the device rather than the stock HTC Recovery).

12. Now that TWRP Recovery has loaded, tap the "Install" button and select the UPDATE-SuperSU-v1.94.zip file you previously downloaded.

13. One the SuperSU zip file has been flashed, select the "Reboot System" option to reboot your device.

14. After the device restarts, you have successfully rooted your HTC One (M8). From here, you are now free to install custom Kernels, ROMs, and other mods as you see fit.

I hope this helps everyone out. I am not a developer, nor do I pretend to be. Please give thanks to the people that made all rooting and modding our phones possible

Special thanks to gdnewsevry1 for recognizing a missed step and command.