Hondata

So I uploaded a flash months ago and its been running great, unplugged battery and put in a new header but once i try to put the key in accessory II the anti theft(green Key) flashes on and off repeatedly and then the temperature gauge goes solid white. tried returning ecu to stock with no luck. Please Help me!

I don't think this is a FlashPro problem. Sounds like you have a short somewhere that is interfering with the immobilizer. Have you checked your grounds? Something may have come loose while you were installing your header.