I'm having issues using the replay mode on my boxer 250c also. My coils are stainless. Works speraticly and not well when it does. I keep getting check atomizer when it's messing up. Even after I checked all my connctions in my atomizer again. I only just got it Monday. I' not sure if the service pack I updated caused this because it worked great the first day and I uploaded the service pack and now this. I' going to try to roll back my device.