How to Factory Reset a Galaxy S8 If You Can't Turn It Off Without a Password

Firstly, it is crucial to ensure that your data is backed up before proceeding with a factory reset. In situations where you cannot turn off your Galaxy S8 without a password, you can perform a hard reset by following these steps:

1. Press and hold the Volume Up button and the Bixby button.
2. While continuing to hold the Volume Up and Bixby buttons, press and hold the Power button.
3. When the Android logo displays, release all three keys.
4. Use the Volume down button to navigate and highlight 'Wipe data/factory reset.'
5. Press the Power button to select.
6. Use the Volume down button to highlight 'Yes' and press the Power button to confirm.
7. Once the reset is complete, select 'Reboot system now.'

After following these steps, your Galaxy S8 will be reset to its factory settings, erasing all data. Remember that this process should only be done if absolutely necessary, as it will remove all personal information from the device.