How to reset your screen
On top of the screen here is a small hole - Insert a paperclip or similar and push down until you feel the click.
Press and hold until the screen reappears.
Next press REBOOT
Your screen may then ask for your wifi details. These are the details on the NetThings sticker on top of the white ista unit.
Username should begin with NT, and the password is the details next to PWD.
Please see attached video link showing how to reboot the screen.
Smartpay Reset Video www.ista.com/uk/software/smartpay/