1. Clear the cache or all data, delete all non-system files that are known to be deleted, restart the phone or restore the factory settings, and then try downloading the application again;

2. Take the mobile phone as an example. The mobile version uses universal firmware, but uses Unicom card. This may happen. If you switch back to the mobile card, there will be no error prompt. At this time, the serial number and IMEI code displayed at the bottom of the page may be abnormal in "Settings →" About Mobile Phone "of the mobile phone;

3. Is the channel for purchasing mobile phones regular? For example, some second-hand mobile phones with hardware decoding may prompt this error, and there is basically no way. It is recommended to send after-sales service to detect faults;