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Downgrade T-Mobile HTC One M8 to Official Stock Firmware with RUU

Tweaking your T-Mobile HTC One M8 is easy, but after unlocking the bootloader of your phone, rooting its system, or updating its OS with a custom ROM firmware, you might want to go back to stock Android. Downgrading your T-Mobile HTC One M8 to stock / official Android software might be required if you have flashed a buggy ROM, or if you are experiencing soft related issues. Thus, this tutorial will be useful if you want to fix your bricked HTC One M8, or if you will want to restore your smartphone back to its initial state.

As you might have noticed, downgrading your Android phone back to stock ROM is not that easy, especially since the stock OS is so hard to find for the T-Mobile HTC One M8. But, fortunately for you, we managed to find the RUU that’s compatible with the T-Mobile version of the HTC One M8, so by using the guidelines from below you will be able to learn how to easily flash the same on your device. This operation is official, so you will not complete a custom procedure that can damage your phone. As I have already stated, in fact, this tutorial can be also used for fixing a bricked HTC One M8, so you have nothing to worry about.

Do note though that we are dealing with a manual update / installation procedure, so reading all the lines from below is a must. In case you somehow mess things up, you can end up in damaging or in bricking your handset. Therefore, before applying anything on your phone just read and follow the guidelines that are being explained during this step by step guide.

Using RUU for downgrading your T-Mobile HTC One M8 back to stock firmware is similar with using Odin for flashing a stock ROM on a Samsung braded device. Therefore, you are only flashing an official Android OS on your phone without completing other complex operations – root access and a custom recovery image installed aren’t required in this case. Anyway, if your smartphone is rooted and flashed with CWM or with any other custom recovery image, don’t worry, because this guide can be safely applied on both locked and unchained devices.

The only thing to ensure before starting the downgrade process is to relock the bootloader of your T-Mobile HTC One M8 – of coursed do that only if you have previously unlocked the bootloader of your handset.

Moreover, since you will restore your Android device back to its initial state, the best will be to backup your data before doing anything else. I recommend you to complete this process, because everything that’s saved on the internal storage memory of your HTC One will get wiped out and your data might also get corrupted. So, use compatible backup and restore apps from Google Play and save anything you might need afterwards, including your contacts list, call logs, market apps, text messages, internet settings and personal data, info and accounts.

On the other hand, it is important to prepare your phone for the downgrade operation that will follow. Do that by reading and applying the steps from the following list – don’t skip this section as it is the most relevant one.

  • A Windows powered computer will be required as the RUU can run only on the same; of course your T-Mobile HTC One M8 and its USB cord should be near you.
  • A connection between your devices will have to be established; so on your phone from path “menu – settings – developer options” the USB debugging option must be enabled.
  • Furthermore, on the computer you are using, before applying anything else, deactivate – only temporarily – the antivirus and any other security protection – these tools might interfere with the downgrade operation.
  • Then on your PC install Android SDK and Fastboot: use our guide and learn how to install Android SDK on Windows.
  • Take your device and check its battery status: if the power left is less than 50% plug in the charger before going any further – else your device might get turned off in the middle of the flashing process and you will risk in bricking it.
  • This step by step guide is compatible only with the T-Mobile model of the HTC One M8 – the RUU file is suitable only with the mentioned smartphone, so don’t complete this tutorial in other conditions.

How to Downgrade T-Mobile HTC One M8 to Official Stock Firmware with RUU

  1. First of all, connect your device with your computer by plugging in the USB cord.
  2. Then go to the Fastboot folder and from there open a command prompt window: press and hold Shift keyboard key while right clicking on a blank space.
  3. On the cmd window type “adb reboot bootloader” and press enter.
  4. From Bootloder then on your phone highlight and select Fastboot option.
  5. Up next, on the same cmd window, enter “fastboot oem lock”.
  6. Good, now we are sure that your phone’s bootloader is being locked.
  7. On your computer download the RUU file for your T-Mobile HTC One M8 by going to this page.
  8. Now, with your phone booted in Fastboot mode and with your device connected to your computer, just run the RUU executable file.
  9. From the window that will be displayed click on the “update” option and from there just follow the on screen options.
  10. In the end, your phone will reboot automatically, meaning that you can remove the USB cord.

So, there you have it; you now know how to easily and safely downgrade your T-Mobile HTC One M8 to stock Android firmware using a compatible RUU. That’s all for now, but don’t forget to use the comments field from below for sharing your impressions, experience and your thoughts with us and with our readers.

HTC One M8 Articles

  • crzy

    Can I use this method with my rogers Canada m8 and right ruu?

  • Ashish Vashisht

    i have relock the phone and my update fails now i cant install any other rom in my mobile can you pls help me out to repair my mobile..