There's a pretty good summary of the iMID diagnostics menu over on the driveaccord forums, most of this sequence comes from their info.
Go in to accessory mode (or start the car, any mode with the iMID powered up.)
Press NAV, Back, & Menu at the same time, holding for about 4 seconds. You should get diagnosis menu on the upper screen and a Monitor Check menu on the lower screen (if you have it on.)
Use the wheel, scroll to 'Detail Information & Setting' & press Enter.
Use the wheel and pick 'Version'
I don't know all the different versions yet, I'll attach a shot of mine so we can compare.
Select 'Return' at the top of the screen several times to get out, or power off the car. Be careful exploring these menus, some can save settings in your car. I would stay away from the 'Update' or 'Download' options, unless you have an idea what they do. At least one person who tried one of the 'Update' option said it started some sort of process he had trouble getting out of.
edit: If I could attach a pic... I can't seem to in this forum. Is the only option to link to an external pic?
A couple key versions:
Flash 1.00.2115
ERATO IPL 01.18.1001