Hi,
Thank you for posting your query on Microsoft Community.
As per the description, I understand that your surface pro is stuck on update screen.
I would suggest you to refer to the suggestions by Steven_B replied on February 13, 2014 and check if that helps.
You may also refer to the Microsoft help article given below and check if that helps.
Hope this information helps. Please let us know if you need any other assistance with Windows in future. We will be happy to assist you.