How to Upgrade ROM / Firmware on Android HTC One (M8) (AT&T/Cricket).

Upgrade ROM HTC One (M8) (Cricket). Today's guidebelajar will show you how to Upgrade ROM / Firmware on Android HTC One (M8) Smartphone. Upgrading your android system will increase phone performance, patch any security hole, increase battery performance, and much more. If you now have HTC One (M8) you can following this guide to upgrade your device. HTC One (M8) device Available released on 2014, March, this device is the smartphone with 5,0 Inchi wide Super LCD3 capacitive touchscreen, 16M colors, work on Android OS, v4.4.2 (KitKat), upgradable to v6.0 (Marshmallow) and supported with Quad-core 2.3 GHz (US/EMEA)/ 2.5 GHz (Asia, China) Krait 400 CPU, GPU Adreno 330, combined with 2 GB of RAM and 4 MP on main camera, and 5 MP on secondary camera.

On this guide not available for Verizon Wireless Devices. However, select Verizon Wireless devices can be updated using the HTC Sync Manager software. So you must download HTC Sync Manager software Here.

Prerequisite.

1. D0wnload HTC One (M8) ROM. Here
2. ROM  Versions.

4.28.502.2

What's new on this ROM.

On this ROM provides the following key enhancements:

• Stagefright patch
• ROM size 1,5 GB

Guide to Upgrade ROM / Firmware on Android HTC One (M8).

1. Make sure your device is HTC One (M8).
2. Make sure you have full battery charge or at least you have 80% of battery capacity.
3. Make sure your HTC One (M8) device is connected to AT&T 4G/LTE or a stable Wi-Fi network
4. Make sure to confirm that this software upgrade to 4.28.502.2 is a newer version than what is currently loaded on your HTC One (M8) device.
5. If your software version is the same with this version, just cancel to proceed with this guide.
6. To check your software version you can go to ;
• All apps > Settings > About and locate the Software information.
7. Then, if your software version is less then 4.28.502.2 you should proceed with this upgrade.
8. Installation.
• On-Line Installation.
• When your HTC One (M8) device goes On-Line, you can download and install the update from the device.
• Go to home screen then tap All apps, 
• Then tap Settings
• Tap AT&T software update.
• Then tap Check for updates.
• Now, tap Continue to download the update.
• If downloading the update using the mobile data network (not connected to Wi-Fi), you may be prompted with a data fee warning message. If this is acceptable, tap YES to start the upgrade process.
• 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 4.28.502.2
• Now your HTC One (M8) device will reboot and begin the installation.  
• The process will take approximately 10 minutes.
• Once the system update is complete, tap OK to continue. 
• Attention: During the upgrade process, your HTC One (M8) device will reboot multiple times. (this is normal) and the software upgrade will show on the screen. So, Don't do this on your device;
• Remove the charger.
• Switch off the device by press power button for a long time.
• If you did it, your device might damage.
• Manual system update.
• Use this method to upgrade the HTC One (M8) device will delete all data and information stored on this device. Make sure you backup all data before proceeding this task.
• Use this method if you are outside of AT&T/Wi-Fi coverage or the update is not found on your HTC One (M8) device.
• Download and save the HTC One™ ROM update to your PC.
• Then, Connect your  HTC One (M8) device to your PC via the original 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 HTC One (M8) device is properly recognized on the PC, locate the HTC One™ 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 HTC One (M8) 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.

Troubleshooting.

If the ROM update process fails to recognize the HTC One (M8) device, close the wizard and then follow this step below;

1. From powered Off state device, Press and hold Volume Down + Power Button to access download mode.
2. Then, connect the HTC One (M8) device to the PC while in this state and attempt the ROM update again.
3. Once the upgrade process finished, you can exit from download mode by using volume keys to navigate to reboot and press the Power button to confirm it.
4. Finish.

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