Tutorial To Unlock Bootloader on HTC U Ultra

We have included all the steps in this post to unlock bootloader on HTC U Ultra. Simply, follow this guide and you will end up unlocking the bootloader successfully.

If you get bored with the stock firmware of your smartphone and want to play around with more customization, then you will need to get your device rooted. But you can’t be able to root your device before unlocking the bootloader.

HTC U Ultra unlock bootloader

What is Bootloader?

In simple words, a bootloader is a set of instructions that are executed automatically, whenever the device is turned ON. The operating system and Kernel need bootloader instructions to start the boot process and operate the recovery mode.

Moreover, you can find the bootloader on every Android smartphone, but the location may vary depending upon different smartphone brands.

By default, the bootloader of every smartphone is locked. The reason behind it is very obvious as every manufacturer wants the users to stay with their default provided skin and stock ROMs.

But as we know, Android is open-source and that gives more power and benefits to users to customize their smartphones with endless possibilities. Therefore, Android also provides users an alternate route to get a chance to customize their smartphones.

This process requires many hurdles ahead. It starts with unlocking the bootloader and so on the process continues with rooting and at last you can end up flashing the custom ROM on your device.

So, we get to know that unlocking bootloader is the permission for users to make different levels of customization from their end.

Benefits of Unlocking Bootloader
  • Gaining the root access
  • Allows to flash custom recovery
  • Installing different custom ROMs

  • This process may void the phone warranty
  • The performance of your phone might also get affected
  • The process might brick your phone, if anything goes wrong
  • Might become a reason for disturbing the security of your smartphone
  • You might also lose the data available on your phone storage.

How To Unlock Bootloader on HTC U Ultra?


  • You need to charge your smartphone to at least 70% or above.
  • Grab the original USB cable of your smartphone.
  • Make a complete back-up of your important data. Note: It will wipe all the data available on your phone storage.
  • Download HTC U Ultra Drivers.
  • Download ADB and Fastboot tool. Windows and MacOS. (Extract the zip file and then install it on your PC)

Step 1: Enable The Developer Option and OEM Unlock

To enter the process of unlocking, you are required to enable the developer option first and then USB Debugging and OEM unlock.

  • Go to settings on your phone.
  • Locate the About Phone and then tap on it several times until the Developer option get enabled.
  • Get back to the main Settings and then tap on Additional Settings->Developer Option.
  • In Additional Settings, just tap on USB Debugging and OEM Unlock.

Step 2: Unlocking Bootloader on HTC U Ultra

  • Download and install HTC U Ultra USB drivers from the above pre-requisites section.
  • Go to the official HTC page and log in to your registered account, otherwise sign-up and create the account.
  • Now, click one the drop down "Select your device" and select your phone model.
  • After selecting, click on the green button below displaying "Begin Unlock Bootloader".
  • Continue with "Yes" and proceed with following the on-screen instructions.
  • Turn your Phone OFF.
  • Now, boot your phone into Fastboot mode.
  • Grab the original cable of your smartphone and then connect it to your PC.
  • Open the Command prompt using the administrative privileges and navigate to the directory c:\Adb. Now, type the following commands to access the ADB directory.
  • Type cd/ and then press enter key to execute

Again type cd adb and press enter to execute

Now, when you are in ADB directory, type in the following command in Command Prompt

fastboot oem get_identifier_token ---- Hit the enter key to execute the command!

  • After that, command prompt will generate the Device Identifier token, simply copy the complete token from command prompt and paste it in HTC page manual and press the submit button.

Be patient! Wait for the email consisting of unlock bootloader code file for your HTC U Ultra. (It can take up to 24 hrs maximum).

Step 3: Executing HTC U Ultra Unlock Bootloader Code File

  • Open the email containing unlock_code.bin file, copy and paste it to c:\Adb directory.
  • Now, enter your phone into fastboot mode.
  • Connect your phone to a computer using original cable.
  • Open the command prompt using administrative privileges and navigate to c:\Adb directory. (Mentioned before in Step 2)

Now, enter the below command and press enter to execute

fastboot flash unlock token Unlock_code.bin

  • By doing so, you will get a pop-up message on your phone screen, "You try to unlock the bootloader".
  • Simply, proceed with "Yes" using volume up/down and Power buttons.

It will reboot your phone and after the boot up, your device bootloader will be unlocked.

HTC U Ultra Specifications

HTC U Ultra unlock bootloader

HTC U Ultra comes with 5.7 inches Super LCD5 touchscreen, providing the resolution of 1440 x 2560 pixels.

Moreover, the phone runs on Android 7.0 (Nougat), also upgradable to Android 8.0 (Oreo) powered by a Quad-Core processor.

The internal memory of the phone includes 64/128 GB with 4 GB RAM and also support micro-SD card.

The camera features 12MP primary lens with Dual-LED flash including other features and 16MP secondary lens for selfies.

It is powered by Li-Ion 3000 mAh battery. Officially available in Black colors.

Price of HTC U Ultra is about 250 EUR.

How To Boot HTC U Ultra Into Fastboot Mode?

  • Turn your Phone Off Completely.
  • Now, press and hold Volume Up, Volume Down, and Power buttons simultaneously.
  • Once, the bootloader windows appear on the screen, release all the buttons.
  • Among all the mentioned options, select the "Fastboot" option using the Volume up/down and Power keys.

Now Your Phone is in Fastboot Mode!