You should exit the adb shell by now and enter the windows command prompt. dd if=/dev/block/mmcblk0p8 of=/sdcard/mmcblk0p8 Upon entering the su command, you may get a SuperSU request on the device, grant it. So, execute the following commands in the command prompt one by one:
Now the first task is to get the P8 file from your device. If not, reinstall the drivers on your device and try again. Connect your device to the PC using a USB cable and make sure the device is detected by the PC. Navigate to the folder where you’ve extracted the ADB and Fastboot files and open a command prompt by pressing Shift + Right-click on any empty space inside the folder, and select Open command window here from the context menu. How to Restore Software Status to Official on HTC One M9 If you haven’t rooted your device yet, follow this tutorial. Set up ADB drivers on your PC or d ownload and extract the ADB and Fastboot tool on your PC. If you have installed HTC Sync, uninstall it temporarily to avoid any problem. Download and install HTC USB Drivers on your computer. Charge your HTC One M9 above 60% battery level to avoid shutdowns during the process. We are not responsible for any misfortunes, proceed with extreme caution and play safe. The procedure described in this tutorial is considered risky and making even a single mistake in modifying the HEX code or executing the commands might brick your device. So, if you’re ready to bring back the Official status of your bootloader, follow the guide carefully. You can simply and accurately fix the software status by going as deep as a machine level language which has crazy HEX codes. In this method, you don’t need to install an RUU and lose everything on your device. 
We’ve recently covered an article on how to restore HTC One M9 to stock, you can find it from the below link: This method will be a bit hectic but nothing’s too hard to learn if we are determined, right? Luckily, scotty1223of XDA has succeeded in restoring the software status to Official but the process is a little complex than before. But with HTC One M9, HTC has once again covered many rat holes and left a challenge to developers. However, HTC can’t block the developers forever and soon there came many methods to change this status bit. It will be market as Official by default but will turn to Modified once you tamper with the device. If you hold an HTC M9 in your hand, reboot to the bootloader mode and you’ll see Software Status at the top. Every HTC smartphone is shipped with a locked bootloader and comes with various security layer to detect any illegal and unauthorized software tampering. HTC is one of the smartphone manufacturers which is keenly determined to secure the software on their devices.
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