The answer to 'how to replace panel upgrade' is to replace your home's electrical panel with a larger, more modern one. This is often necessary when your home's electrical needs have grown beyond the capacity of the original panel, such as when adding major new appliances, a home addition, or upgrading to an electric vehicle charger.
The process involves shutting off power to the existing panel, removing it, and installing a new, larger panel that can handle your home's current and future electrical demands. This is a complex task that requires the skills of a licensed electrician to ensure it is done safely and up to code.