Its time to update your HTC One A9 (US GSM) to Android 7.1.2 Nougat. However, its not with the help of official firmware but via custom ROM. Recently a developer shared Android 7.1.2 Nougat based custom ROM LineageOS 14.1. This official LineageOS 14.1 ROM help you to upgrade your HTC One A9 (US GSM) to Android 7.1.2 Nougat. Since, the development of LineageOS 14.1 ROM still in progress, you can expect more bug fixes as well as new features when new version rolled out which you can download and install either via OTA or manually. If this interest you then read through this guide to learn necessary steps to install Android 7.1.2 based custom OS LineageOS 14.1 to HTC One A9 (US GSM).
Android 7.1.2 Nougat comes with various useful features including multi-window multitasking, better notification management, faster device with better battery optimization, more human emoji, improved security, instant app and much more. Top of all LineageOS custom ROM comes with various additional features that surely improve your using experience.
Warning!
This tutorial is only for HTC One A9 (US GSM). Don’t try this guide on any other Android device. Also, we (True Android Team) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.
1. Backup your device data. You can follow our ultimate backup guide.
2. Make sure your device have at least 60% battery power. You can install an app like Battery Percentage on your Android device to check it easily.
3. You already have USB Driver Installed for Galaxy Note 5 SM-N920C in your PC. [Download USB Drivers]
4. Make sure USB Debugging is enabled otherwise you won’t able to transfer file between PC and Galaxy Note 5 SM-N920C. [Guide].
5. Your device have latest CWM recovery or TWRP recovery installed. [Guide]
If you done everything that we mentioned above then you are ready to follow step-by-step guide on how to install Android 7.1.2 Nougat based LineageOS 14.1 ROM on HTC One A9 (US GSM).
- LineageOS 14.1 ROM For HTC One A9 (US GSM) [Filename: lineage-14.1-20171017-nightly-hiaeul-signed.zip]
- Google Apps [Filename: open_gapps-arm-7.1-micro-20161125.zip] or any other Android 7.1.2 Nougat GApps
How to Install Android 7.1.2 Nougat based LineageOS 14.1 ROM on HTC One A9 (US GSM)
- Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.
- Disconnect USB and then turn off your HTC One A9 (US GSM).
- Now, boot into recovery mode. To do so, press and hold Volume Down and Power button together to boot into HBOOT menu, from there select Recovery [use volume buttons to scroll and Power button to select]. Alternatively try this: Recovery Mode without Key Combination.
- Perform a Nandroid backup of your existing ROM that you can restore later if this new ROM not work or you want to go back into your previous ROM. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
- Now, perform data wiping task. To do so, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping.
- Select install zip from sdcard, then select choose zip from sdcard (or /sdcard1 for external storage). Now, locate the LineageOS 14.1 Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin.
- Once the ROM installation process end, repeat the step 6 but choose the open_gapps-arm-7.1-micro-20161125.zip file instead of ROM zip to install the Google apps package.
- When installation is completed, go back to the main recovery menu and select reboot system now to reboot your HTC One A9 (US GSM) and boot up into Android 7.1.2 Nougat ROM LineageOS 14.1.
- Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.
- Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.
- Disconnect USB and then turn off your HTC One A9 (US GSM).
- Now, boot into recovery mode. To do so, press and hold Volume Down and Power button together to boot into HBOOT menu, from there select Recovery [use volume buttons to scroll and Power button to select]. Alternatively try this: Recovery Mode without Key Combination.
- Create a Backup using TWRP Backup Option.
- Perform a Factory Reset (this will delete all apps and their settings and game progress). To do this, Tap on Wipe, then at the bottom of the screen do a Swipe on the ‘Swipe to factory reset‘ option.
- Now its time to add zip file for flashing. Tap on Install, then browse to the location where you saved the files and tap on the LineageOS 14.1 Zip file. Then tap on Add More Zips, and add open_gapps-arm-7.1-micro-20161125.zip. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.
- When installation is completed, go back to the main recovery menu and tap on Reboot and then, tap on System to reboot your HTC One A9 (US GSM) and boot up into Android 7.1.2 Nougat ROM LineageOS 14.1.
- Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select Backup then through Restore option, restore your previous ROM by selecting it from the list.
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