Hard Reset HTC One S9

First method:

1. At the very beginning hold down the Power key for a short while in order to switch the device off.
2. In the next step press and hold the Volume Down + Power button for a several seconds.
3. You may release held keys as soon as the Download Mode menu appears on the screen.
4. Afterwards use the Volume keys to select option "Bootloader", and press Power button to confirm.
5. Then press Volume Down to select option "Reboot to Recovery Mode", and press Power button to confirm.
6. As soon as the phone with the exclamtion piont appears on the screen hold down Power key.
7. While holding down the Power button press and release Volume Up key.
8. Next select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
9. Next, choose "Yes -- delete all user data" to confirm the whole operation.
10. After that select option "reboot system now".
11. Well done! The factory reset has just been performed.

Second method:

1. At the very beginning hold down the Power button to turn the device back on.
2. Then from Main Menu go to Settings and tap Backup & Reset.
3. Afterwards choose Reset phone and select Erase all data.
4. Tap OK to confirm your choice.
5. Success! Your device is ready to use.

Hard Reset HTC One M9 - bypass screen lock

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.