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If you need to check for a system update on your htc one m8 you can go into the settings, and scroll down to the bottom where it says system updates. Once there click on the system update option, and from in here you will see the update now option. For the most part your htc one m8 should already have the auto update option checked, but even so you can just try clicking the auto update to see if an update is available. After your htc one m8 updates it will automatically restart and you will be all done.