What you experienced is not normal, did the CSS generate a core dump? if you do show core, are you seeing a file there? if yes, I will recommend you to open a TAC case so we can analyze that.
Regarding your question:
css# sh ver
Version: sg0820303 (08.20.3.03)
Flash (Locked): 07.50.1.03
Flash (Operational): 08.20.5.01
The really important one is the Version output, Flash Operation is an historical for track purposes, of the latest code, that the CSS has ever used, so every time that you upgrade the code to the latest brand new code, that value is going to be updated, but if you do a downgrade, that will not cause any difference, so you do not need to worry about it.
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