Offcourse we should overwrite it !!! Because you need to delete all data from MAP partion of your Navi HDD and then put all data from this update !!! How do you update it usually ? But we are talking about different things - you're talking about Navi programm "firmware", and i'm talking about firmware of head unit... Is MD5 now okay for both parts of update ?
Yes, I was talking about the software and not the maps.
You can see the firmware version in KvaK's post
http://prius-club.su/index.php/topic,2651.600/msg,93200.html as well, he has VA00102A