Some of you might know that in Windows there is a process of digital signing that ensures the security and authenticity of an application. That is, a digitally signed application is trusted, and therefore the user can install those applications without compromising the security of their computer. Antivirus programs usually warn users if the program is digitally not signed. Similarly in Nokia Symbian phone, the application vendors are required to sign their apps to ensure that its from a trusted source.
These are the error messages that would appear during mobile software installation in Nokia phones.
Certificate expired
Installation failed contact the application supplier.
Unable to install a protected application from an untrusted supplier.
Update error.
Hint: You may have tried installing unsigned application. Note that signing is mandatory for S60 3rd Edition. You can use self-signed certificate or developer certificate from Symbian Signed to sign your application.
Message: Unable to install. Constrained by the certificate.
Hint: This message pops up when you attempt to install developer certificate in the unsupported device. The developer certificate from Symbian Signed can only be used in a limited number of devices. Remember that you have to send your IMEIs to Symbian Signed when requesting certificate. You cannot use the certificate in other devices that is not in your IMEIs list.
Message: Required application access not granted.
Hint: Check that your certificate can be used to sign all capabilities needed by your software For example, if you use self-signed certificate, you can only sign basic set capabilities, i.e. NetworkServices, ReadUserData, WriteUserData, LocalServices and UserEnvironment. If your application requires one of the extended capabilities, for example SwEvent, you cannot sign it with self-signed certificate. In this case, apply for developer certificates from Symbian Signed.
Message: Unable to install a protected application from an untrusted supplier.
Hint: If you use self-signed certificate, make sure that your application uses unprotected UID, i.e. 0xA0000000 - 0xAFFFFFFF. If you use protected UID (0×20000000 - 0x2FFFFFFF) or legacy UID (0×10000000 - 0x1FFFFFFF), you will get this message.
Message: Unable to install.
Hint: This message may come up when your installation file (.sis/.sisx) copies files to other application’s private folder, i.e. \private\uid. Note that Symbian 9 introduces data caging concept, it means you don’t have access to other application’s private folder.
Message: Expired Certificate
Hint: Do this…
Set the phone date back by 7-8months..
Message: Update error
Hint: Uninstall any previous version of the application, then switch on/off the phone and install again
Try this method to sign and install unsigned mobile softwares .
Tags: certificate error, certificate expired, contact application supplier, Install unsigned softwares, protect application from untrusted supplier, unable to install from untrusted