CIT
CIT is a HyperOS diagnostic application used for testing the hardware components of the device. It checks the functionality of the display, sensors, cameras, microphone, speakers, communication modules, and other internal systems. The CIT interface is usually hidden from regular users and can be accessed through a special combination in Settings or a dialer code. This tool is primarily used in Xiaomi factories and service centers to perform quality control, detect malfunctions, and calibrate hardware.
Download CIT. Download the CIT app for HyperOS and MIUI.