These are the instructions to unlock the bootloader of the HTC 10 smartphone using the fastboot tools on Windows Computer.
Requirements: Your device should have at least 20 percent or above battery to follow the instructions.
Unlock Bootloader of HTC 10 Smartphone
- Download and install HTC USB driver on your computer. If in case HTC USB driver is already installed on the computer then SKIP this step.
- Enable USB Debugging on your HTC Device. To enable the USB debugging: Open Settings > Developer Options > USB Debugging > Tap on the Checkbox to Enable it.
- Power off your HTC 10 Smartphone.
- Now, you need to boot into the bootloader mode. To boot into bootloader mode, Press and hold the Volume Down Key and Power Key (for 4-5 seconds) and release the power key but keep holding the Volume Down key until bootloader mode is visible on the screen.
- Connect your HTC 10 Smartphone to the computer.
- Download and install the Minimal ADB and fastboot tools on your computer.
- Once, Installation is completed Launch the Minimal ADB and fastboot tools.
- Now, you will be able to see the following command window.
- Now, In the command Window, write this command and press enter: fastboot oem get_identifier_token
- Now, you will be able to see the unlock data (string) that you have to copy. To copy, right click in the command window and select Mark.
- Open HTC Dev website and create a new account (If you dont have HTC account then you have to create it).
- Sign In to your HTC Account and Open the HTC Dev Unlock Bootloader Page.
- On Unlock Bootloader page, you will find the Supported Devices section on the left side. Under Supported Devices, Select “All other supported models”. After that click on the Green Begin Unlock Bootloader Button.
- Now you will be able to see pop-up confirmation message Are you sure you wish to continue?, click on Yes to continue the unlocking process.
- Again you will see a pop-up which prompts to accept legal terms. Tick both boxes and click on the Proceed to Unlock Instructions button.
- On the next page you will be able to see instructions to enter into Bootloader mode on your Phone, which you have to ignore as you have already entered into the bootloader mode in Step#4. Simply, scroll down the page and Click on Proceed to Step 5 button.
- On the Next Page Enter the Copied Unlock Data (string) into the My Device Identifier Token Area and click on Submit Button.
- Now, HTC will send you the Unlock_code.bin file on your registered Email ID (through which you have logged in Step#14).
- Download Unlock_code.bin file on your computer and Move it to the Minimal ADB and Fastboot folder (C: Program Files > Minimal ADB and Fastboot).
- Once you have successfully moved the Unlock_code.bin file, Open the Command Window and type the following command: fastboot flash unlocktoken Unlock_code.bin
- You will be able to see some processes on your HTC Device, and your HTC Device will reboot automatically.
- Now you will be able to see the Warning Bootloader Unlocked Message (this confirms that you have successfully unlocked the bootloader on your HTC Device).
(Developer Options is hidden for Android 4.2.2 or above, to make it visible: Go to Settings > About Phone > Built Number > Tap on it for 5-8 times).
In the Bootloader Mode, Highlight Fastboot (using the volume up and down) and press the Power button.
Using the Mouse select the whole unlock data (string) as shown in the below picture:
Once you have selected the unlock data (string), left click the mouse button to copy.
 Unlocking the Bootloader will delete your personal data including contacts, pictures, apps etc from your device. So, backup your personal data before following the above tutorial.
 Once you have successfully unlocked the bootloader of your HTC device, you will get the Warning Bootloader Unlocked message whenever you start or restart the device.
 HTC Stock Firmware: If you are looking for the original firmware for your device, then head over to Download HTC Stock Firmware page.
 HTC USB Driver: If you are looking for the original USB Driver for your device, then head over to Download HTC USB Driver page.