How to Take a Screenshot on Sony Xperia Z1

Option 1. For Galaxy S7 and earlier: Press and hold down the power and volume-down buttons simultaneously for a few seconds; For Galaxy S8 and Note 8: Press and hold down the power and Home buttons simultaneously for a few seconds.
Option 2. Go to Settings > Advantages features and enable Palm swipe to capture the screen by swiping your hand across the screen from left to right or right to left.
Option 3. Take out the S Pen from the bottom-right side of Samsung Galaxy Note 8, then press the button at the top of S Pen and use S Pen to long press the screen capture.


https://www.gihosoft.com/android-recovery/how-to-take-a-screenshot-on-android.html

It all depends on the tablet make, for MS Surface you press the volume down and windows button simultaneously and it will capture you screen display and place it in the screenshot folder.

press Volume Down and Power Button

You have to hard reset your Xperia Z1. NOTE: Backup your files because a hard reset will erase ALL your data and settings (copy them to your PC or somewhere else). You will have to set up your phone from the beginning.

1. Open the SIM card slot.
2. There you'll se a little red button. Press it with a toothpick or something thin and hold it for 3-5 seconds.

If this doesn't work, try this:
NOTE: Before doing this, your battery must be half or more full (as in previous method).
1. Turn off your phone.
2. Reboot phone by pressing the power button and volume up botton together.
3. Using volume keys, navigate to Wipe Data/Factory Reset and confirm it with the power button.
4. Wait for the process to finish. You'll have to set the phone up from the beginning.

If you have a 4.0 or Later operating system, Press and Hold the volume and power button down together.