the Japanease version of the PRS-650 is delivered with firmware version 1.0.00.12200. On the japanease SONY homepage is an update to a newer version available. I installed this update on my device. But I think for the later conversion this was not important.
My main problem until now is that the problem with the device IDs (e.g DRM) is not solved. I am working on a solution.
So from my side I can not provide at this time the software/firmware I installed on my device, because this contains secret information from a third person.