Updating the devdata.dat file for FIFA 09 is a relatively straightforward process. Here's a step-by-step guide:
For nearly a decade, PC modders and advanced users of FIFA games relied on a file named DevData.dat located in the game’s root or Game directory. Unlike standard game data compressed in .big archives, DevData.dat served as a developer toggle—a leftover from EA’s internal testing builds. Its primary function was to instruct the game to load loose files (e.g., .ini , .txt , .lua ) from folders instead of from packaged archives, effectively enabling a “modding mode.”
After spending 10 hours testing the latest release, here is what stands out:
Once files are installed, you may need to manually load them. Navigate to . Select the updated file to apply the 18/19 rosters.