Android reset loop
"Step 1: First and foremost, you’ll need to pull out your device’s battery. Then, wait for around half a minute before reinserting.
Note: For those phones where battery is not removable, power down the phone and keep it powered off for 5 minutes. With almost all modern batteries, that’s equivalent of disconnecting the terminals (thus breaking the electron flow enough to draw away all residual power) and then reconnecting them. Five minutes is a safety buffer, could work with even less than that, but we’ll recommend five minutes nevertheless.
Step 2: Boot into Recovery Mode. The steps will vary depending on your particular device, and since I won’t be listing each and every one here, you may have to do a little research. As an example, booting a Samsung device into Recovery Mode involves holding Volume Up + Home + Power simultaneously.
Step 3: In Recovery Mode, navigate to Wipe data/factory reset and select it.
Step 4: The aforementioned three steps should do the trick, but if not, you may also wish to try wipe cache partition.
Step 5: Head back to the main menu and reboot the device by selecting reboot system now."
http://www.redmondpie.com/how-to-fix-or-recover-android-boot-loop-on-stock-and-rooted-device/

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