Ultra acts as a "shell." You must still install the official BMW eSys launcher and the massive PSdZData (firmware data) files separately. Ultra then hooks into that installation.
Enter the "Wrapper" era. Developers created frameworks around eSys to stabilize it. was the first major rethinking, acting as a launcher and manager. BimmerUtility (BU) started as a token management tool but evolved into BimmerUtility Top —a standalone application that doesn’t even need eSys installed for most code/FAVO functions. esys ultra vs bimmerutility top
Avoid cheap, poorly shielded OBD2 cables. Use a high-quality, dedicated ENET cable to ensure a stable, uninterrupted data stream between your PC and the car. Ultra acts as a "shell