issues with Enterprise home screen set up on TC55

On my TC55 device, when I try to setup Enterprise home screen, accidentally I had removed EHS app from phone and now i am in user mode.

In this user mode I am not able to access settings and not even allowing me to install any apk .

 

Need a solution for below:

Is there anyway to go back to admin mode

or is there any key combination (or any other method)  to factory reset the complete device.