Like almost every Android device, the HONOR X9b comes equipped with a set of "Secret Codes"—special character sequences that grant immediate access to hidden menus, diagnostic tools, and advanced settings. These codes, often utilized by technicians and developers, allow users to troubleshoot hardware issues, check sensor accuracy, and retrieve vital information without installing third-party apps.
If nothing happens, double-check the code. Some HONOR models disable specific engineering codes on retail firmware for security reasons. How to Use Secret Codes on HONOR X9B