This software upgrade available for your HTC One M9 provides the following key enhancements:
                
               
               
                
                 ·
                 
                 
                
                
                 Bug fixes
                
               
               
                
                 ·
                 
                 
                
                
                 April 2017 Android Security Updates
                
               
               
                
                 
                  Details
                 
                
               
               
                
                 Before you proceed, please confirm that this software upgrade to
                 
                  4.30.617.12
                 
                 is a newer version than what is currently loaded on your device. If it is the same version, there is no need to reload the software. Navigate to the Home screen, then tap
                 
                  All apps
                 
                 >
                 
                  Settings
                 
                 >
                 
                  About
                 
                 and locate the
                 
                  Software information
                 
                 . If your Software number is less than
                 
                  4.30.617.12
                 
                 , you should proceed with the upgrade.
                
               
               
                
                 
                  WARNING: During the upgrade process the device will reboot multiple times and show software upgrade screens. Do not remove the AC charger or long-press the Power button as this might stop the update and your device may be rendered inoperable!
                 
                
               
               
                
                 
                  Getting Started
                 
                
               
               
                
                 Before you proceed with the update, make sure you have done the following:
                
               
               
                
                 ·
                 
                 
                
                
                 Set aside approximately 20 minutes to allow the device to update
                
               
               
                
                 ·
                 
                 
                
                
                 Connect the device to a charger
                
               
               
                
                 ·
                 
                 
                
                
                 Ensure the battery is charged to at least 35%
                
               
               
                
                 ·
                 
                 
                
                
                 Connect to Wi-Fi to access and download the update
                
               
               
                
                 
                  Installation instructions
                 
                
               
               
                
                 To download and install the update from the device, follow these steps below:
                
               
               
                
                
                
                 Follow the "Getting Started" steps above.
                
               
               
                
                
                
                 From the Home screen tap
                 
                  All apps
                 
                 , tap
                 
                  Settings
                 
                 .
                
               
               
                
                
                
                 Tap
                 
                  System updates
                 
                 .
                
               
               
                
                
                
                 Tap
                 
                  HTC software update
                 
                 .
                
               
               
                
                
                
                 Tap
                 
                  Check now
                 
                 .
                
               
               
                
                
                
                 Tap
                 
                  DOWNLOAD
                 
                 to download the update.
                
               
               
                
                
                
                 The status of the download can be checked in the Notifications pull down.
                
               
               
                
                
                
                 Once the download is complete, the user will be prompted to install from the Notifications pull down. Tap the System update to begin the upgrade process.
                
               
               
                
                
                
                 Tap
                 
                  OK
                 
                 to begin the update process to software version
                 
                  4.30.617.12
                 
                 .
                
               
               
                
                 
                  WARNING: During the upgrade process the device will reboot multiple times and show software upgrade screens. Do not remove the AC charger or long-press the Power button as this might stop the update and your device may be rendered inoperable!
                 
                
               
               
                
                
                
                 Device will reboot and begin installation. Users will not be able to use their device during the installation process (approximately 10 minutes).
                
               
               
                
                
                
                 The system update is complete. Tap
                 
                  OK
                 
                 to continue.
                
               
               
                
                
                
                 For best performance, open
                 
                  Play Store
                 
                 and tap the
                 
                  Menu
                 
                 icon, then select
                 
                  My apps
                 
                 and ensure all installed apps are updated.
                
               
               
                
                 
                  Manual system update instructions:
                 
                
               
               
                
                 If you are outside of Wi-Fi coverage, or the update is not found, you may perform a manual system update via USB connection to a PC. This process requires that you download and install HTC Sync Manager first in order to get the proper drivers. If you do not have HTC Sync Manager installed already, you may download the software from
                
                
                 
                  
                   http://www.htc.com/www/software/htc-sync-manager/
                  
                 
                
                
                 .
                
                
               
                
                 
                  WARNING: Performing the system update manually will delete all information from the device. Ensure all information is backed up before proceeding. See the Help & How To section of this website for more information on backing up your device contents.
                 
                
               
               
                
                 
                  Performing the ROM Update:
                 
                
               
               
                
                
                
                 Download and save the HTC One™ M9 ROM update to your PC.
                
               
               
                
                
                
                 Connect your device to your PC via the supplied USB cable.
                
               
               
                
                
                
                 If the device is not recognized by the PC, ensure you have HTC Sync Manager installed and then disconnect and reconnect the device from the USB cable.
                
               
               
                
                
                
                 Once the device is properly recognized on the PC, locate the HTC One™ M9 ROM Update that you downloaded. Double-click on the file to launch the system update wizard.
                
               
               
                
                
                
                 Follow all of the system update wizard instructions shown on your PC.
                
               
               
                
                
                
                 Once the update is complete, click
                 
                  Finish
                 
                 in the Wizard and the device will reboot.
                
               
               
                
                
                
                 Once the device reboots, the initial setup wizard will appear.
                
               
               
                
                
                
                 After the initial setup process is complete, open
                 
                  Play Store
                 
                 and tap the
                 
                  Menu
                 
                 icon, then select
                 
                  My apps
                 
                 and ensure all installed apps are updated.
                
               
               
                
                
                
                 After initial setup and updating all apps, the device is ready for use.
                
               
               
                
                 
                  Note
                 
                
                
                 : If the ROM update wizard fails to recognize the device, close the wizard and then follow the steps below:
                
               
               
                
                 ·
                 
                 
                
                
                 From a powered off state, hold
                 
                  VOLUME DOWN
                 
                 while powering on the device to access download mode.
                
               
               
                
                 ·
                 
                 
                
                
                 Connect the device to the PC while in this state and attempt the ROM update again.
                
               
               
                
                 To exit download mode manually, use the volume keys to navigate to
                 
                  reboot
                 
                 and press the
                 
                  POWER
                 
                 button to select it.