I own Galletto v54. Many times I successfully read and write the file from / in EDC16C34 via OBD. But I encountered a problem, once after writing, car reported an error with the configuration of the ECU (ENG man faulty system). Inectors lost their coding, as well as other components of the vehicle. Car can't over 3000rpm. The problem I solved by Lexia, coding of all components.

I'm interested in whether the EDC16C34 ecu safe to read and write via OBD using Galleto v54? At the forum, I came across a variety of answers, some say it is the only safe way BDM, a second and that the OBD safe.
Does to work via OBD or BDM??