If OBD reading fails due to security locks or encryption, you may need to use a tool like K-TAG to perform a BDM (Background Debug Mode) read directly from the ECU board.
suggest the issue could be related to low-quality internal components (often called "farlocchi") on some red PCB clones, which may require hardware reworking. Are you working with a specific ECU model (like EDC16 or EDC17) or a particular vehicle
In rare cases, especially with clone units, a loose TF card or poorly soldered chips on the internal PCB can cause communication errors that mimic security failures.