"Best Thermal paste for heat sink/cooler?"に関する回答Arctic Silver thermal paste will work like a charm. I have used it before and it worked well for me. If you don’t know how to apply then you can check this guide https://www.thecrazybuyers.com/best-thermal-pastes/
"Stuck at apple logo and battery gets warm"に関する回答In most cases, you can solve these problems by putting the phone into recovery mode and restoring it from backup. To do that, follow these instructions: 1. Connect the iPhone's USB cable to your computer, but not your iPhone. 2. Turn your iPhone off. If the phone won't turn off in the traditional manner, just keep holding the buttons until the screen goes dark. 3. Once you've turned the device off, press the home button on the face of the device and plug in the USB cable to the device's dock connector. 4. When it turns on, keep pressing the home button until the iTunes logo appears on the screen. 5. You'll know the phone is now in recovery mode because a window in iTunes will tell you. 6. You can then start the restore process by clicking the "Restore" button in the iTunes window.
"Turn off safe mode"に関する回答Press and hold power and home button until the screen goes off completely.