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I downloaded data from a EDR where the ignition cycle at the event is more than 300 cycle at the investigation. It shows the number of cycles the SIR lamp was on/off at over 300 cycles and 26 cycles since the DTC was cleared at event enable. Question: How can I prove that the data from the deployment event is from my event? This is the first time I had a 300+ cycle different.

There are a number of ways to determine if the data is related to the crash you're investigating, but much of it depends upon the type of data file you have. If you post the .cdrx file of the data we might be able to offer suggestions.