Yes you can use your old screen of the bricked machine as a donor . However have you tried a soft reset. Start by unplugging the tablet. Hold down the power button for a full 30 seconds without interruption ignoring the screen prompts then after the 30 sec release the button and then press it to start. Then do a factory hard reset to clear the bad app. Before doing a factory reset or hard reset make sure you have at lest 40% battery life. Go to “Settings” > “Device Options” > “Reset to Factory Defaults” > “Reset” .Once you've done this you will have lost all your apps and data except for what is in your amazon account in cloud storage Hope this helps