To truly understand the RPKG, you need to know what lies inside. The Nokia 5320 (RM-409) firmware consists of several critical files that are bundled into the RPKG:

Reboot & test:

If you were a mobile phone enthusiast between 2008 and 2012, the Nokia 5320 XpressMusic needs no introduction. Known as the "Game-on, Music-on" phone, it packed a dedicated sound chip (the Yamaha DA3), dedicated gaming keys, and Symbian S60v3 FP2 into a candybar shell.

Support files used by flashing tools to identify the correct file versions.