Although HTC one A9 comes with stock Android Marshmallow 6.0 and it gets regular updates for bug fixes and security patched. But if you have rooted your HTC one A9 then you won’t get any more OTA updates. To get the updates you will have to revert back and install stock Marshmallow on HTC one A9.

HTC one A9 is the latest flagship of HTC. It has everything it takes to be a great smartphone. Its design is sleek and stylish. it has premium aluminium body. Along with fingerprint scanner. HTC one A9 has great processing power, it has Snapdragon 617 and it is accompanied by 3GB RAM. The camera has great result and it is of 13 megapixels. All and all it has everything to stand with the latest smartphones of this year, although it was released in November 2015.

How to Install Stock Marshmallow on HTC one A9 (RUU File)

The installation of stock Marshmallow on HTC one A9 is quite easy, as it comes in RUU file. The latest software update version is 1.57.651.1. To install stock marshmallow on HTC one A9 you have to download the firmware that is below and install the latest HTC driver or Install the HTC sync manager on your computer.

Prerequisites:

  • Download the RUU file from here (Source)
  • Verify that your device is compatible for the update file.
  • Enable USB debugging on your HTC one A9. (Goto Settings>About Phone> Tap Build number multiple times till you see new Developer Options. Now in the developer options enable the USB debugging.
  • Make sure your phone is charged above 50%.

Now the process is simple. Download the RUU file from above on your computer. Make sure you have HTC Sync manager installed. Now connect your device to your computer and run the RUU.EXE file.

The setup will guide you step by step and in the end your phone will end up running stock Android 6.0 Marshmallow.

Caution: While the system is in flashing process it will restart multiple times and show different screens. Do not disconnect your phone from computer and dont press the power button as it might shut down your phone.

If you have any queries regarding how to install stock Android Marshmallow on HTC one A9, let me know in the comments. You can ask any questions regarding the above guide. Dont forget to give feedback when you are done with flashing stock ROM on your HTC phone.

 

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