1. **Press and Hold the Power Button**:

 - The simplest method to exit fastboot mode is by pressing and holding the power button on your device.

 - Keep holding the power button until your device restarts.

 - This method often works for many Android devices, but it may not be effective in all 

cases.

2. **Perform a Force Restart**:

 - If pressing the power button alone doesn't work, you can try performing a force restart.

 - To do this, simultaneously press and hold both the power button and the volume down button for about 10-15 seconds.

 - This should force your device to restart and exit fastboot mode.

3. **Remove the Battery (if applicable)**:

 - For devices with removable batteries, another option is to remove the battery while the device is in fastboot mode.

 - After a few seconds, reinsert the battery and power on your device.

 - This action may trigger the device to restart and exit fastboot mode.

4. **Use ADB Commands**:

 - If the above methods fail, you can attempt to use ADB (Android Debug Bridge) 

commands from a computer.

 - Connect your device to your computer via a USB cable and open a command prompt or terminal window.

 - Type the following command:

 ```

 adb reboot

 ```

 - This command instructs your device to reboot, which should exit fastboot mode.

 - Note: You need to have ADB installed on your computer and USB debugging enabled on your device for this method to work.

5. **Check Hardware Issues**:

 - If none of the above methods succeed in exiting fastboot mode, there may be an 

underlying hardware issue with your device.

 - Consider contacting your device manufacturer's support for further assistance or taking your device to a certified technician for repair.

It's essential to handle your device with care and caution, especially when attempting 

system-level changes like exiting fastboot mode. By following these steps, you should be 

able to successfully exit fastboot mode on your Android device and resume normal operation.