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How To Unlock Bootloader of AT&T HTC One

HTC did a great job with HTC One as the smartphones rocks with impressive specs and features, the most attention-getting point for me is beautiful metal design. It seems that HTC focused all of efforts on HTC One and of course they have got successes in various lines such as Sense 5.0, great photography features, BoomSound and more.

So we can expect heavy modification for smartphone through custom ROMs, kernels, MODs, and tweaks but before you touch anything, bootloader of your phone needs to be unlocked that is possible via HTC developer center. However the point here to be noted is that unlocking the bootloader voids the warranty of your phone, which means you should think twice first. Of course you’ll receive official updates but after unlocking bootloader stay away from them because it may cause issues.

This guide shows you how to unlock bootloader of AT&T HTC One. You should backup every important piece of data because unlocking bootloader wipes all data, you can you can sync your contacts with Gmail account and for messages use SMS apps, lastly use the carbon Android app to backup apps and data.

Use a Windows PC and ensure that USB phone drivers are installed on your computer, you can use HTC Sync to install drivers.

DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.


Step #1: Download the fastboot package to your PC.

Step #2: Unzip the downloaded file into C drive.

Step #3: Head over to official HTC Unlock Bootloader page.

Step #4: Log in if you already have an account or create  a new account by clicking on “register” button.

Step #5: Once you’re logged in with HTC, open unlock bootloader page here.

Step #6: There you may see a drop down menu “all other supported models”, select it and then click on “begin unlock bootloader” page. It will show up a warning, read it carefully and then click on “yes” button.

Step #7: Accept legal terms when it ask and click on “proceed to unlock instructions” button.

Step #8: There are four steps to follow that we’re explaining in simple words:

Make sure phone is not connected with PC and turn it off. Then reboot phone by holding down volume down and power button until you enter in bootloader mode, then use volume keys to highlight and select fastboot menu using power button. Once you’re in fastboot mode, plug phone to PC using USB cable.

Step #9: Head over to second page on unlock bootloader site by clicking on “proceed to step 5” button.

Step #10: There, don’t follow anything. Instead of following anything on second page, open up the fastboot folder you have unzipped at C drive in “Step #2”.

Step #11: Open up command prompt, you can find it under start menu>programs>accessories.

Step #12: Enter following command on command prompt to enter in fastboot folder:


Step #13: Now issue another command, it will generate the serial number of phone, if it doesn’t generate the serial number your phone is not connected with PC properly, make sure phone drivers are installed:

fastboot devices

Step #14: On the HTC developer site, click on “proceed to step 8” to open next page.

Step #15: There following everything the page ask and at the end click on “submit” button.

Step #16: They’ll show you “token submitted successfully” message on next page and send you unlock key through email.

Step #17: Log in to your mail account, check HTC mail and download “Unlock_code.bin” file that is attached with the mail.

Step #18: Place the Unlock_code.bin” to the Fastboot folder in C drive.

Step #19: Issue following command on command prompt to unlock the bootloader:

fastboot flash unlocktoken Unlock_code.bin

The above command will send a unlock bootloader request on phone, use volume keys to navigate and power key to confirm the request.

Step #20: Your phone will reboot and perform factory reset automatically.

Step #21: Unplug phone from PC.

That’s it, the bootloader of your AT&T One is now unlocked, you can now root the phone, install custom recoveries for custom ROMs and do anything that requires unlocked bootloader. Enjoy! If you experience any error during unlocking procedure, leave a comment below.

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