After downloading the software for Nokia 5730 mobile phone, the certificate has expired during installation? How can I recover from the expert's advice?

Error prompt 1: The certificate has expired.

Problem description: The software certificate has expired.

Solution: 1: Adjust the mobile phone time to the certificate time limit (adjust the mobile phone time several months in advance) before installation. After installation, adjust it back to the correct time.

(How to adjust the time: Settings-Phone Settings-General-Date and Time-Date)

2. Making certificates for mobile phones

Error 2: The certificate is not yet valid.

Problem description: The mobile phone time exceeds the time limit of the software certificate.

Solution: 1: Check whether the date setting of the mobile phone is correct;

2. Adjust the time of the mobile phone to the time limit of the certificate and then install it. Just set it back to the correct time after installation.

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