If you press the MAIN and TRIP buttons , a menu is displayed , this will give details of the current pcm level and software versions. If the car is MY2005 and original PCM fit , then level 3 will the furthest update possible. As you stated originally the PCM2.1 cannot be updated to give MP3 playback as the hardware doesn,t support it. There are few if any noticeable differences between software version 3 and 4.1 (the last version). Dont get hung up on the software version, it doesnt really matter. Post code search and trafiic message capability is part of the MAP DVD not the PCM software.
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