Not good. There are also some shortcomings in the Corolla large-screen navigation modification. Modifying a large-screen navigation requires wire-breaking installation, which will cause a certain degree of damage to the original vehicle wiring and increase the risk of vehicle failure. The quality of some modified navigation brands is unstable and prone to problems such as inaccurate navigation and slow response, which affects the driver's experience. The after-sales service of the modified navigation is not as good as that of the original navigation. Once a problem occurs, you need to bear the repair costs yourself.