PMDG 737-800/900 Optional Models Update what exactly is this?

[flightsimmer747 0]

Its found under service updates.Regards From Joe

[fozzy 1]

If you have the 800/900 this wil update the 600/700 cockpits to 800/900 standard. Bye, Luca

[flightsimmer747 0]

so i need it regardless of which version i have of the 800/900.Is this the reason why some things don't work in the 600/700 even if i updated to 800/900. Example wipers the new panel is there , installed in the 600 but wipers don't work?

[fozzy 1]

yes :) Bye, Luca

[Guest DP1]

I'm interested in this update too but am not sure if I need it. I have the 800/900 V1-1 so from what I see above I'll still need this update, true? In another thread someone was talking about using a Models Update every time he adds a new livery, is this update what he was talking about?Dave