The 5320 natively supported the second-generation N-Gage gaming platform. Its ROM contains the exact graphic libraries ( .dll files) and application structures required to run advanced 3D mobile games.
The core files required for device booting. nokia 5320 image rom rpkg
The Nokia 5320 XpressMusic (released 2008) is a Symbian S60 3rd Edition Feature Pack 1 smartphone. An "image ROM RPKG" in this context refers to a packaged firmware image used for flashing the device—typically a binary ROM image wrapped in Nokia's packaging format used by flashing tools (RPKG often denotes "ROM package"). This write-up covers what such an RPKG contains, how it’s structured, how it’s used, tools and precautions, and troubleshooting. how it’s structured