Doro Live demo mode on Doro 8100/8110

To reset the device:

Power it down then wait a minute.
Press Volume Down and Power at the same time and release when phone turns on displaying the “Reboot System Now” screen. While pressing the Volume Down and Power buttons, this reboot screen might take until 27 seconds to come up.
Use volume up/down and power to make this selection and select “Wipe data/factory reset”.
Use volume up/down and power to make this selection and select “Factory data reset”