You are suppose to take a copy of it before you embark on deleting it !. That's why it's better to buy a 16gb mib2 card that the latest mib1 fits on will work. That way you have your old map card and the new card and you don't have to hack the maps down to fit.
There is a copy of the map card on the thread... how these card work if you have a copy of before the year release it works but after it doesn't. Old works, new doesn't. So you can use an old map file in the car then start the edits, if you follow. That's how mib2 standard works.
A version 4 contents will work with a unit that had version 5 in it. Get that working then edit the version onto the latest release.
If you had version 4 but lost it, version 5 wouldn't be much good. You can always search eBay if nobody steps forward to
help.
Clear as mud.