Changing from in to bracket mount???

I am going from an in dash mount to a bracket mount on the bow and dash. There are screws sticking out the back where they were mounted to the in dash plates. How do I remove these Don't want to break the seal and void warranty. Can I use a dremel tool to cut these off? Thanks.

Do you have a Lowrance unit? If so, take off the face plate of unit and you should be able to see the 4 corner mounting screws, to unscrew.

Yes I do have a Lowrance unit. How do I take off the face plate? Never mind I googled it and found the answer. Thanks for the help.