YMMV, but I wasn't able to get into the database section of the OpenFlash Manager with just installing the new version over the top of my old one. I had to completely uninstall it, reboot my computer, and then install the new version fresh before it would try to update the tablet. After that happened, I was able to get into the database section and load the .dev file. Everything seems to work so far, gotta go plug it into the car now!
...and now it's not letting me back into the database section. I keep getting an index out of range exception. I just now realized that my rom isn't supported yet (ZA1JA01D, US 6AT) so that probably has something to do with it not working.