Lost password on Galaxy S2, can't shut down My new Christmas Galaxy Tab S2 7":
I was prompted to download an updated OS. I did so successfully and was prompted to restart. Okay, now I need my password.  That is ONLY the password works, since the fingerprint won't work until the TAB is restarted after the update.  But what WAS my password???  The information on the web says I can factory reset easy enough, but step one is to shut it off.  I can't do that without getting past the password input stage.  So far my Galaxy is a lovely-to-look-at, high tech paperweight.  

So how do I either force it off so I can continue with a factory reset (including password) process, or go from where I am (at the password input stage) to a factory reset?  (I think the password was among the Christmas wrapping that went as smoke up the chimney.)
To force the Galaxy Tab E to restart, hold the power and volume down keys for around 20 seconds. This has the same effect as physically removing the battery. If this does not work, attempt holding all four physical buttons for 20 seconds. After the device is turned off, start it up in the recovery mode by holding volume up + home + power. Highlight Wipe data/factory reset with the volume keys and select it using the power button. Select Yes and the tablet will be restored to factory specifications. Finally, select Reboot system now to restart the device.
During the setup process, Factory Reset Protection may kick in. Log in to the Google Account previously used on the device to disable it.