If your phone displays a "no valid OS" message, you may need to perform a factory reset or reinstall the operating system. Restart the phone by holding down the power button until it turns off. Then, press and hold the power button and the volume up button simultaneously to enter recovery mode. From there, you may have options to clear cache or perform a factory reset. However, this step will erase all data on the device.
Asked Jan 11, 2026 12:04 AM