1. Is the mobile phone set to the current time?
2. Whether the mobile phone has enough power or storage space (storage space is recommended to be at least 1GB).
3. If the mobile phone system update prompts that the registration failed, it may be a network problem. It is recommended to try again another day or connect to a stable wireless network/mobile data network (the firmware may be large, so it is recommended to connect to WLAN to upgrade).
4. If the problem still exists, it is recommended that you take the purchase invoice, maintenance card and machine to Samsung Service Center for inspection.
Note: If the mobile phone system update prompts that the device has been modified, it may be because the mobile phone has been refreshed. It is recommended to contact Samsung Service Center for handling.