There are a few things to be done;
a. If you don't have a USB-serial cable, you'll need to get one. While it's safest to get the Uniden USB1, there are many after-market ones that will also work just fine. We have an extensive article on this subject in our wiki - be CAREFUL that you don't buy one of those el-cheapo knockoffs from fleabay - the Chinese have invaded this market, and you don't want to go that route...(note: both here and in the wiki, links are always blue)
Connecting scanners via USB - The RadioReference Wiki
Be very aware of what operating system you are using - Windows has become finicky as all get out about getting the right drivers for the right OS
b. FreeScan has a setting on the upload form to wipe all systems and settings - you will want to do this to start off, and any time you make wholesale changes to your programming (and you undoubtedly will do this more than once). This is important - if you are simply making changes to a system or group, then use the REPLACE option.
c. While you can't determine the production date, you can see whether your firmware is up to date. This article gives you the particulars...
Updating the Firmware in Uniden DMA Scanners - The RadioReference Wiki
Be very sure to follow any of the directions EXACTLY. Do not take any shortcuts, no matter how odd the instructions may be.
If it were me, I'd pop the covers and check for loose connections (particularly between the antenna jack and circuit board). That's a good price for a used scanner - if a bit low. It's possible someone was getting rid of it because their area was going to Phase 2.
One more thing - we also have an article that kinda takes you from the beginning and shows you the various things you will need to know. The Easier to Read manuals (written by a RR member) are also linked at the bottom of...
Program your DMA Scanner - The RadioReference Wiki
Mike