The phrase "to upgrade the camera" means to improve or replace the camera with a better or more advanced one.
Sentences with «to upgrade the camera»
It's also upgraded the camera and processor to a level that compete with most flagship handsets. (pocket-lint.com)
Both phones also feature upgraded camera software that should be better at handling low - lighting conditions. (theverge.com)
For instance, this project allows users to change or upgrade the camera in their phones without the need to buy another phone with a higher - megapixel camera. (techtimes.com)