There are quite often multiple revisions of Bin Files that are released for a particular ECU Part Number. When this is the case you will see an ECU Part number listed with the revision following the part number.
e.g. 21175-0084_F56924D and 21175-0084_F569254D
The best way to determine which Bin File revision is within your stock ECU is to Read the ECU, this will load the Bin File that is currently in the ECU into the Woolich Racing Tuned software. If we do not currently have the Bin File, the Woolich Racing Tuned software will prompt you to send the bin file through to Woolich Racing so we can add it to the software.
We like to ensure that you have access to all of the Bin Files for a particular model so you can always flash your ECU back to stock. You will not be able to Write to the ECU until you have sent us the Bin File.