Hello RK,
welcome back to the Polycom Community.
Did you ever solve your issue => here<= ?
Providing information on older posts helps other community members.
In regards to your new question did you have any errors during the upgrade or did you lose power ?
The community's Video FAQ contains this post here:
Jun 21,2014 Question: How can I factory restore a HDX system?
Answer: Please check the Administrator’s Guide for "Using the Restore Button on the Polycom HDX System" or the community's search results => here<=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services