Don't Manually Install If You Aren't Comfortable
And finally, don't install the Android Oreo update right now if you aren't comfortable with the manual installation instructions.
You can manually install the Nexus 5X's Android Oreo update right now if you don't want to sit around waiting for Google's Oreo OTA. Thing is, you should only go this route if you feel one hundred percent with the process.
Manually installing Android software can save you time if you know what you're doing. Sideloading software can cause you major problems if you don't.
Before you decide, please take a look at our walkthrough. If it sounds like gibberish, you probably don't want to manually install Android 8.0.
Android users with an average skill set generally will want to wait for the OTA.
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