There is a problem with the settings of your software
Use your mobile phone serial number to go to the Symbian Mobile Forum to apply for a certificate, and then use the certificate to sign the software before installing it
Or Just crack the phone directly
Synchronize the current time, double-click the time in the lower right corner of the desktop
Select "internet time" and enter update immediately and confirm
Browser settings Default security level, right-click "internet Explorer" to enter properties
Select "Security", enter "internet", enter "Reset all areas to default level (R)" and confirm