Archived:Installing self-signed SIS files to Nokia Eseries devices not allowed by default (Known Issue)
By default, some S60 3rd Edition (for example, Nokia Eseries) devices only allow installation of trusted, that is, Symbian Signed applications. To also allow installation of self-signed (untrusted) applications, go to
Application Manager > Options > Settings > Software Installation
Change the setting from "Signed" to "All", if needed.
The error message shown to the end user is: "Certificate error. Contact the application supplier."
The application supplier should instruct the customer to check the settings in case the supplier delivers self-signed applications.
Note that the security settings may also differ in operator variants of S60 3rd Edition devices.
See detailed description.