Error messages Symbian S60 – How do you solve?

Very often the operating system Symbian, during normal use, it returns any errors or alerts. This is quite normal for an OS, but sometimes there troviamoin difficulty in being able to interpret the message and thus solve the problem.
Today we see the main reports:
Error in the certificate contact the application vendor – This is the classic error message that the operating system returns when you try to install a software not certified. I remind you that any application installed on the smartphone symbian need a certification. To solve this problem we must necessarily signing with a valid certificate or install our application on the smartphone after hack Symbian.
Unable to install the application invalid certificate – This error is returned when the application and sign an appropriate certificate to the device. What does this mean? Each device has an IMEI code and therefore the certificate is unique for this code. To obtain a valid Certificate you can read the guide in our section certificates and obtain a certificate for your device.
Unable to install protected application from an untrusted supplier – Tip: If you use auto-fsigned certificate, make sure that the application uses unprotected UID, ie 0xA0000000 – 0xAFFFFFFF. If you are a protected UID (0 × 20000000-0 × 2FFFFFFF) or UID (0 × 10000000-0 × 1FFFFFFF), you get this type of message. The message can be made even when the installation file. Sis or. Sisx copy file folder all’internop private folder, ie \ private \ uid. The best solution in these cases is to install the application utilizzado the hack and not the certificate because the hack “open” all the possibilities of writing on the folders protected by the system Operti.
Expired certificate – This error message is returned when you try to install an application with the certificate expired. To overcome this problem should change the date of relefono and bring back a few months and try to perform the installation again. If does not work either so further amend the date brought back six to seven months.
Upgrade Error – If you can not upgrade an application, uninstall the old version and turn off the phone. Access your phone and install the new version of the program.