It is possible to scale parts in the slicer software but this may not produce a workable end product. We don't know the print that you are wanting but it is possible that the designer made the dimensions the way they were for a reason.

As to firmware updates, it depends what you are running currently. Also before you attempt any updates make sure that you have a copy of your existing firmware settings, that you know work, so that you can roll back if you encounter any issues.