Technically, Harry's wand never gets fully "fixed" in the traditional sense. Here's why:
* The core is damaged: The phoenix feather core of Harry's wand is the source of its magical power. It's inherently linked to his own magic and can't be replaced without affecting the wand's unique properties.
* The connection is unbreakable: Harry and his wand have a deep, magical connection. The damage to the core represents a change in their bond, which can't be reversed simply by repairs.
* The "fix" is temporary: Throughout the series, Harry's wand is repaired multiple times. Ollivander even mentions that its "healing" will continue over time. However, these repairs are only temporary fixes, and the wand remains fragile.
However, Harry's wand does work, and he continues to use it throughout the series. This suggests that it functions well enough, even with the damaged core.
So, while Harry's wand doesn't get fully "fixed," it does work effectively, and the repairs allow him to continue using it throughout his magical journey.