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The Samsung Galaxy S4, model i9505, features a 13-megapixel rear camera, and a 5-inch 1080p display.

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Why is my phone on constant reboot?

It buzzes, shows samsung 4 logo, stay on that screen for a bit, goes black, then starts the process over. The battery is fully charged.

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Your phone is stuck in a bootloop and something is causing it to be in a bootloop. I would start with replacing the battery, sometimes even overcharging a battery can cause this. If that does't fix it then you may have to reflash the OS on the device.

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What does mean and how to reflash the OS on the device?

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