Phantom 3 Pro firmware ??

Hi, I just bought a used phantom 3 pro and I would like to check if the firmware needs upgrading. The DJI site no longer supports this drone and firmware isn’t on there for downloading. I get a data control error on the screen, and apparently this can be fixed with a firmware upgrade but it’s no longer available. Any ideas? Thanks.

Scroll to the bottom of this page. All of the P3P firmare versions are available for download there: