The answer to 'how to fix panel upgrade' is to upgrade your home's electrical panel to a larger, more modern panel that can handle your current and future electrical needs. This may involve replacing the entire panel, adding a subpanel, or upgrading the main service to your home. The process typically includes shutting off power, removing the old panel, installing the new panel, connecting the new wiring, and restoring power.
Panel upgrades are an important safety and efficiency upgrade for older homes, but they require careful planning and execution by a licensed electrician. Attempting a panel upgrade without proper training and equipment can be extremely dangerous and may result in electrical fires or shocks.