Hi, I am A. Stevens here to help with your question!
It appears that your tablet is now in "download" mode.
You can attempt a factory reset, but it may not work.
You may have to load the software manually using a software called ODIN.
Give this a try first:
Press and hold the Power/Lock key, tap Power off, and then tap OK to turn off the tablet.Press and hold the Power/Lock key and Up Volume key at the same time.Release the Power/lock key when the Samsung logo appears.Release the Up Volume keys when the Android image appears.When the menu appears, press the Up Volume key to select wipe data / factory reset.Press the Power/Lock key to select.Press the Down Volume key to scroll to Yes – delete all user data.Press the Power/Lock key to select.Press the Power/Lock key to select reboot system now.
Tried the factory reset but didn't work. Will investigate odin.