E-Sys works in tandem with a critical database known as . This package contains all the firmware, configuration files, and coding data for BMW vehicles. Without the correct PSdZData version, E-Sys is an empty shell, unable to communicate with or understand the modules in your car.
Understanding the feature set helps users maximize the tool:
When connecting to a car with a newer software level, an error like "Found project ... with incompatible psdz job version" may appear. This indicates that the PSdZData is too old for the car's current I-level.