Here is how you can bring them back to life:
-remove battery (only phones)
-plug into the house socket the charger and leave it there
-now hold Volume Down (-) button and then plug in the charger and count to 10 or 15.
-release the button, unplug the power and tap 3-4 times the POWER button
-now hold the POWER button 30 seconds (tablet). For smartphone put the battery in while holding POWER.
-release button and do a normal start or restart.
That is it, no service, zero cost!
-remove battery (only phones)
-plug into the house socket the charger and leave it there
-now hold Volume Down (-) button and then plug in the charger and count to 10 or 15.
-release the button, unplug the power and tap 3-4 times the POWER button
-now hold the POWER button 30 seconds (tablet). For smartphone put the battery in while holding POWER.
-release button and do a normal start or restart.
That is it, no service, zero cost!