Most of the time ECU flashing works without a problem but there is always the small chance that something could go wrong.  ECUs typically have their own error-logging system internally and when the ECU detects that it has found an error, it will produce an error code (diagnostic trouble code or DTC) which is normally represented as a number.  These error codes can sometimes be seen on the dash directly, or in the Diagnostics window of the Woolich Racing Tuned software.  Other times the error code requires a special tool like an OBD2-reader to read the error code and find the meaning.

One such example is ECU Diagnostic Code 50 which can be translated as "Faulty ECU Memory".  

If you find yourself in this situation please do not panic as the Woolich Racing technical support team have seen these problems before.  Please open a support ticket so that we can provide you with further information to get you up and running again.