How to Fix a Kindle Fire Boot Loop
Errors caused by apps, updates or other data failures can lead to problems with the boot functions of the Kindle Fire’s operating system. When powering up, the device starts the booting process but can’t complete it, and a loop ensues. Before you send your Kindle Fire off for servicing, try to fix the problem yourself by performing a hard reset.
Turn off the device and charge it until the indicator light turns green, indicating a full battery. This can take up to five hours depending on the Kindle Fire model you have and the amount of charge the battery started with.
Turn the device on and wait for the Kindle Fire logo to appear.
Press and hold the power button for 20 to 30 seconds to initiate a hard reset, which reboots the device and often fixes the errors that can cause a boot loop.
Turn the Kindle on to confirm that it’s working. If the looping continues, contact Amazon to request a repair.