This command will take about a minute to complete, and once it does, you'll see a line that reads FAILED (remote: 90 hboot pre-update! please flush image again immediately). fastboot flash zip "location-of-RUU.zip".Developer Edition M7 RUU.zip (courtesy of HTC1Guru)Äownload your RUU.zip file directly to your computer and enter the following commands to begin the flashing process:.T-Mobile M7 RUU.zip (courtesy of HTC1Guru).Developer Edition M8 RUU.zip (courtesy of Nkk71).Sprint (Harman Kardon Edition) M8 RUU.zip (courtesy of O.M.J).Sprint (non-Harman Kardon Edition) M8 RUU.zip (courtesy of O.M.J).T-Mobile M8 RUU.zip (courtesy of Sapplegater).Verizon M8 RUU.zip (courtesy of Dottat).The RUU installs all of the original, carrier-specific system files that shipped with your device, so be sure to download the file that matches your device exactly. You now have a device that has no indication of being modified, but in order to get the software back to stock, you'll need to use a RUU, aka ROM Update Utility. Your bootloader menu should now only display LOCKED at the top. After the commands are issued, leave your One plugged into your computer and on the bootloader menu. The commands vary between the M7 and M8, so make sure you are using the correct one. To get started plug your device into your computer, open up either Command Prompt (Windows) or Terminal (Mac/Linux), and then enter the following commands: In this case we will use the universal Super CID. Since you converted your original CID to the Google version you will need to bring it back to a Sense compatible version to install the appropriate firmware file. The CID of your device is one of the many indicators that decides which firmware and ROMs you can install. If you are using a converted M7, you can skip this section and go directly to "Reset Warning Flags" below. Due to some system partition size differences, you must first flash a Sense firmware file before being able to go back to stock Sense. The Google Play Edition version of the HTC One M7 is fairly simple to convert back and forth between Sense and Vanilla Android, but that is not the case with the M8. If You Are Coming from a Converted Google Play Edition M8 It should go without saying, but this will completely wipe your device, so be sure to back up your pictures, music, and videos before starting.Enable USB Debugging in order to send ADB commands to your One.It does not matter whether you are using a Windows PC or Mac, just be sure that you are using the latest version of ADB/fastboot. ADB and Fastboot will be need in order to send the install commands to your device.In order to avoid any hiccups during file transfers, you will need to use a USB 2.0 port when connecting your One to your computer.Root permission will also be needed if you plan on resetting the warning flags on your bootloader menu.Before getting started, I'd recommend reading this entire guide one time to make sure your device meets all the qualifications. The general process is mostly the same across all devices, but the files and exact steps vary depending if you are using a Sense or Google Play Edition device. Since HTC has released countless variations of both the M7 and M8 HTC One, it can be a pain in the ass finding the right files and tools to get your phone back to stock settings. Returning your device to stock, whether it is because you need to sell it or just want to receive OTAs again, is not always a simple process.
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