Hard Reset HTC Jetstream 10

First method:

1. Turn off your device.
2. Press and hold  Volume Down + Power at the same time for a few seconds.
3. Release held keys when you see Bootloader Mode.
4. Then press Volume Down to select option "Factory reset", and press Power button to confirm.
5. Well done!

Second method:

1. Turn on the tablet by using the Power button. 
2. Afterwards go to Settings and then to Storage.
3. Tap Reset Device. 
4. Choose Erase Everything if you are sure you want to clear all your data. 
5. Select OK to confirm the whole operation.
6. Well done!

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