To perform a hard reset on a Samsung Galaxy F15, follow these steps:

Method 1: Using Hardware Buttons
1. **Turn Off the Device**: Make sure the device is completely turned off.
2. **Enter Recovery Mode**:
Press and hold the *Volume Up* button and the *Power* button simultaneously.
Release both buttons when the Samsung logo appears, and the device will boot into the Android Recovery Mode.
3. **Navigate to Wipe Data/Factory Reset**:
Use the *Volume Down* button to scroll down to “Wipe data/factory reset”.
Press the *Power* button to select it.
4. **Confirm the Reset**:
Use the *Volume Down* button to highlight “Yes”.
Press the *Power* button to confirm.
5. **Reboot the Device**:
Once the reset is complete, “Reboot system now” will be highlighted.
Press the *Power* button to reboot the device.

Method 2: Using Settings Menu
1. **Open Settings**: Go to the Settings app on your device.
2. **Go to General Management**: Scroll down and tap on “General Management”.
3. **Select Reset**: Tap on “Reset”.
4. **Factory Data Reset**: Select “Factory data reset”.
5. **Confirm**: Follow the on-screen instructions to confirm the reset.

Important Notes:
**Backup Data**: Ensure that you back up any important data before performing a hard reset, as this process will erase all data on the device.
**Charge Your Device**: Make sure your device has sufficient battery before starting the reset process to avoid interruptions.

These steps should help you perform a hard reset on your Samsung Galaxy F15.