and testing Symbian software without risking a physical "brick" of the original device. Asset Preservation: Hosts a complete copy of the device's 512 MB ROM

It is most prominently used by the EKA2L1 emulator , which recreates the Symbian kernel and application servers on modern hardware.

The Nokia E5 is a Symbian S60 3rd Edition (Feature Pack 1) smartphone released in 2010. An ROM RPKG (ROM repack / RPKG file) refers to a repackaged firmware image or package used by communities for flashing, customizing, or installing modified firmware and applications on Symbian devices. For the E5, RPKG files typically contain firmware files, installation scripts, and optionally preinstalled apps, themes, language packs, and custom settings.