Mine is showing R1ED001 level
Follow below to check

Either "Menu" -> "Settings" -> "Update service" -> "Software version" or, if you don't have these options in the Settings menu then return to the main screen and...

Press right on the D-pad, let go
Press the * (star key) once
Press left twice
Press *
Press left, let go
press *

This will take you to the "Service" menu.
Select "Service info" (should be first option)
This will take you to the "Service info" menu (no, really?)
Select "Software info" (should be second option
The first line contains the version number. Will say something like "R4CE012" or "R4CF002" or similar.

NB The phone will go through what ever menu's and shortcuts are associated with D-pad movements but just ignore them and carry on!