Requirements:

1. Backup your data: Before you start, it’s crucial to back up all your important data to prevent any loss during the flashing process.

2. Charge your device: Ensure that your Huawei nova 8 SE has sufficient battery life to complete the flashing process.

3. Download firmware: Visit the official Huawei website or other reliable sources to download the correct firmware for your Huawei nova 8 SE. Make sure to download the firmware that corresponds to your device model and region.

4. Enable USB debugging: On your device, go to Settings > About phone > tap on “Build number” seven times to unlock developer options. Then, go to Settings > Developer options > enable USB debugging.

5. Install Huawei USB drivers: Download and install the Huawei USB drivers on your computer to ensure proper communication between your computer and the device.

6. Download and install Huawei Update Extractor: This is a tool that allows you to extract the update.app file from Huawei firmware packages. You can find this tool on various Android forums or websites.

Flashing Process:

1. Extract the firmware package: Use the Huawei Update Extractor to extract the update.app file from the firmware package you downloaded.

2. Download and install Huawei Multi-Tool: This tool is used for flashing the firmware. You can find it on various Android forums or websites.

3. Connect your device: Connect your Huawei nova 8 SE to your computer using a USB cable.

4. Open Huawei Multi-Tool: Run the Huawei Multi-Tool on your computer and follow the on-screen instructions to select the update.app file and start the flashing process.

5. Wait for the process to complete: The flashing process may take some time. Ensure that you do not disconnect the device during the process.

6. Reboot your device: Once the flashing process is complete, reboot your Huawei nova 8 SE.

Remember that these instructions are based on general steps for flashing Huawei devices. The exact steps might vary slightly based on the specific firmware and version you’re using. So we can’t take responsibility for these instructions. Always refer to the official documentation and resources for your device and tools.