Installing TWRP recovery on HTC One A9 smartphones is replacing Google’s stock recovery environment. As the phrase suggests, the Google stock recovery environment is made by the Google team whereas the custom recovery is made by third-party developers. Google doesn’t want you to have the ability to install custom ROMs on your device which is why they do not let you flash a ROM file from a stock Android recovery environment. On the other hand, the third-party developers creating these custom recovery like TWRP recovery are doing exactly that for us and giving us a way in which we can install a ROM file. That’s one of the main reasons for installing a custom recovery; however, it’s not the only reason. Sometimes people wish to install TWRP recovery on HTC One A8 handsets just for the new backup feature we know as taking a NANDroid backup. It’s the only way you can take a complete backup on Android without using adb commands.

Here’s everything you need to know to install TWRP recovery on HTC One A9 devices. Once you flash the TWRP recovery on HTC One 9 handsets, you can start installing custom ROMs if you can find any already available for your device.

REQUIREMENTS

• You must unlock the bootloader on your HTC One A9 before you can start this guide.
• The following guide is made for the HTC One A9 smartphone only and should not be followed on a different device. The files in this guide are unique and made for the A9 handset only. Installing them on the wrong device can brick your device.

BEFORE WE BEGIN

• You do not automatically wipe the device or lose any data when you follow this guide. However, we still advise you backup the data such as settings, phone contacts, SMS and MMS messages, pictures, music, video and anything else you can think of that you prefer to keep.
• Download the ADB and fastboot drivers, as well as the HTC USB drivers from our pages.

HOW TO INSTALL TWRP RECOVERY ON HTC ONE A9

1. Download the TWRP recovery package on your computer from here.
2. Download the modified boot image on your computer from here.
3. Set up Android ADB and Fastboot using our detailed guide.
4. Extract the boot image and the TWRP recovery files by moving them over to the desktop of the computer and then right-clicking the files and selecting the option to extract it here.
5. Right-click over the executable files and rename them to boot.img for the boot image and twrp-recovery.img for the TWRP recovery file.
6. From within the TWRP folder, hold the Shift key and right-click where there is no file. Now choose to open the command window from the menu.
7. Connect the HTC One A9 smartphone
8. Type the first command and hit Enter: adb reboot download
   – your device should now boot into the desired download mode.
9. Type the next command and hit Enter: fastboot devices
10. Type the third command and hit Enter: fastboot flash boot boot.img
    – you’ve now flashed that boot image.
11. Type the next command and press Enter: fastboot reboot-bootloader
    – your device is now in the bootloader mode.
12. Type the next command and press Enter: fastboot flash recovery twrp-recovery.img
    – that command has installed the custom recovery on your device.
13. Those of you who want to boot the device into the custom recovery mode right away can type the command “fastboot boot twrp-recovery.img”. Otherwise head over to the Google Play Store and download the Quick Boot app if your device has root access. The rest of you will need to boot into the recovery mode by using the hardware keys.