How to Unlock and Root the HTC U12+

Updated 5 November 2026 · Standard formula, shown below

Unlocking the bootloader and rooting an HTC U12+ lets you install a patched boot image and use apps that require root access. The process erases the phone, can weaken its security, and may affect warranty or support; back up your data and confirm the exact model and firmware before proceeding.

What You’ll Need

An HTC U12+ with a charged battery, working buttons, and a reliable USB connection.
A Windows, macOS, or Linux computer, a good USB data cable, and Android platform-tools (ADB and Fastboot) from the official Android developer site.
HTC USB drivers on Windows, if the phone is not detected.
A copy of the matching, complete firmware or boot image for your exact U12+ variant and software build, plus the Magisk app from its official project source.
Time to research your exact variant. HTC U12+ models and regional/carrier firmware differ; do not flash files made for another variant.

Step-by-Step

Identify the phone and build. Open Settings > System > About phone and note the model number, Android version, software number, and security patch. Also note whether the phone is carrier-branded. Find trustworthy instructions and firmware specifically matching those details. If you cannot verify a compatible boot image and unlock method, stop rather than trying a file from a similar HTC model.
Back up and prepare. Copy photos, downloads, authenticator recovery codes, and other important files off the phone. Bootloader unlocking normally factory-resets the device. Make sure you know the Google account credentials needed after reset, charge the battery, and install platform-tools. On the phone, enable Developer options by tapping Build number repeatedly in About phone, then turn on OEM unlocking and USB debugging. OEM unlocking may be unavailable on some carrier or regional models.
Check ADB and USB debugging. Connect the unlocked phone to the computer and accept its USB debugging prompt. Open a terminal or command prompt in the platform-tools folder and run adb devices. The device should appear as authorized. If it says unauthorized, unlock the phone and accept the prompt; if the list is empty, try another data cable or USB port and install the appropriate Windows driver.
Enter the bootloader and check Fastboot. Run adb reboot bootloader. Alternatively, power the phone off and use its hardware-button combination to reach the bootloader; consult instructions for your exact variant. In the bootloader, use the volume buttons to highlight the Fastboot option if needed and confirm with Power. On the computer run fastboot devices; do not continue unless a device identifier appears.
Unlock the bootloader. HTC’s unlock procedure has varied by device, region, and carrier. Follow the applicable HTC bootloader-unlock instructions for the U12+ and your variant; do not assume an old HTC web service or a command copied from another model is still available. Some procedures use a Fastboot command to obtain an unlock token, which is then submitted to the manufacturer’s unlock service to receive an unlock file. Use only the instructions and file intended for your device. If no supported route is available, stop—do not use unofficial token services or exploit-based workarounds. Confirm the unlock on the phone when prompted. The device will erase its data and restart.
Set up again and confirm unlock. Complete initial setup, re-enable Developer options, OEM unlocking, and USB debugging, then reconnect and authorize the computer. Reboot to the bootloader and check its status using the menu or the status command documented for your device. An unlocked warning at startup is expected. If the bootloader still reports locked, do not try to flash anything.
Obtain the exact boot image. Use the full firmware package for your current software build and extract its stock boot image with a reputable archive tool. Do not use an image from a different software number, Android release, or U12+ variant. If the package contains separate boot-related images or a payload format you cannot safely identify, consult a device-specific guide before proceeding; guessing which partition to flash can make the phone unbootable.
Patch the image with Magisk. Transfer the stock boot image to the phone. Install the official Magisk app, open it, choose Install, then select the option to patch a file and choose that image. Copy the resulting patched image back to the computer. Keep an untouched copy of the original image and note the patched file’s full name and location.
Flash only the verified patched image. Reboot to Fastboot and connect the phone. Read the device-specific instructions to confirm the correct partition name and whether this U12+ firmware uses a boot image that can be flashed directly. Check the image filename, variant, build, and command before running any write operation. Use the documented Fastboot flash command for that partition, substituting the patched image path; never guess a partition name or use a command intended for another phone. When flashing completes without errors, reboot using the documented command or bootloader menu.
Verify root. Let the first boot finish; it may take longer than usual. Open Magisk and follow any setup prompt it displays, then restart if requested. Confirm root only with an app you trust that requests root access. Do not grant permission automatically: review what each app needs and deny requests you do not recognize.

Common Mistakes

Using a boot image from a different U12+ variant or software build. A mismatch can cause a boot loop or prevent startup.
Assuming “OEM unlocking” in Settings itself unlocks the bootloader. It permits an unlock operation; the separate bootloader procedure is still required.
Skipping the factory-reset warning or forgetting account credentials and backups.
Running Fastboot commands from the wrong folder, using an outdated tool, or flashing a guessed partition.
Accepting root prompts without checking which apps receive elevated access.

Tips

Keep the original firmware package and stock boot image on the computer so you have a recovery reference.
Use a direct USB port and avoid hubs during bootloader operations. Do not disconnect the cable while a flash command is running.
Record the exact software number before modifying the phone. Updates may require patching a new matching boot image.
Root does not automatically install a custom recovery or custom ROM; those are separate operations with separate compatibility risks.

Troubleshooting

adb devices shows nothing: unlock the screen, reconnect, accept the debugging prompt, try another cable/port, and install the correct USB driver on Windows.
fastboot devices shows nothing: confirm the phone is actually in Fastboot, use current platform-tools, change the cable or port, and check the computer’s driver. Avoid repeatedly issuing flash commands while the connection is unreliable.
Unlock is unavailable or rejected: check whether OEM unlocking is enabled and whether the model or carrier permits bootloader unlocking. There may be no supported unlock path for that device; do not substitute files or unofficial bypasses.
The phone boot-loops after patching: stop experimenting with other images. Return to Fastboot and follow a verified, variant-specific procedure to restore the original matching boot image or full stock firmware. If you cannot identify the correct recovery files, seek experienced device-specific help before writing to more partitions.
Magisk does not show root: verify that the patched image was made from the exact installed build, that it was flashed to the documented partition, and that the flash completed successfully. Do not repeat the operation with an image of uncertain origin.

Frequently Asked Questions

Will unlocking erase my data?
Yes. Treat bootloader unlocking as a factory reset and make an off-device backup first.

Does this work on every HTC U12+?
No. Unlock availability and firmware details can differ by region, carrier, and model. Verify your specific variant before starting.

Can I root without unlocking the bootloader?
Magisk’s boot-image method requires a way to install its patched image, which generally means an unlocked bootloader. Do not rely on claims of a universal one-click root method.

Will rooting remove the startup warning or preserve updates?
Not necessarily. Root can change update behavior, and an unlocked-device warning may remain. Check a compatible update and recovery method before modifying the phone.

Can I undo root?
Often, but the safe method depends on the firmware and what was changed. Restoring the matching stock boot image may remove the patch; restoring full stock firmware may be needed for other changes. Verify files carefully.

Is rooting risk-free?
No. A mistake can prevent startup, reduce security, erase data, or affect warranty and support. Proceed only if you can verify every file and command for your exact device.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.