Vacuum mapping incomplete

I received my vacuum yesterday as a gift for Christmas from brother; installed app from WYZE to my android smart phone and made connection to my home wifi, and allowed location of my home.
Map appeared with layout of home; started the vacuum to clean after charging required time, the vaccum mapped all but to bedrooms. Do I need to purchase wifi booster plugs for those two rooms, which are located beyond location furthest away from my wifi router ? in order for the vacuum to map those rooms as well? And will I have to recreate a new map or can it update the existing map?