When restarting the device does not work and the screen still flickers you can perform a factory reset to your amazon fire tablet. Keep in mind that doing so will get rid of any files or downloads that you may have on your device and will also change the settings back to their original set-up; the files cannot be later retrieved. Therefore, if you are looking to perform a hard reset make sure you have transferred the files and documents that you might want to save on some other device. The books and articles purchased from the Kindle store cannot be backed up and will be lost permanently in this process.