HTC one m7 not updating to 4.4

[jreyes1234567890]

My dad just bought a new HTC one m7 unlocked from eBay. When we got it we downloaded the update. When it finished downloading we installed. The screen the showes a phone with a green symbol with a blue line at the bottom. But halfway then the phone turns into a red exclamation point and then reboots to normal. Plz help I'm a beginner at this types of things.

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[Paul627g]

Sounds like the update is failing during the install.

I wonder if the phone has been tampered with since you mentioned bought off eBay.

If you boot into your bootloader it will give you a Tampered flag at the top of its been hacked in any way.