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Message: <blockquote data-quote="Chris Stephens" data-source="post: 1491071" data-attributes="member: 24095">Go to <a href="https://www.holley.com/support/fuel_injection/sniper_efi/" target="_blank">this link</a> and download the SD Card Contents. Save your old SD Card Contents...just in case. Copy these files to your Sniper SD Card and pop it in. UNPLUG THE Y-PLUG AND/OR THE LAPTOP CABLE. ONLY have the handheld plugged in when updating firmware. It will load the latest firmware to the handheld and the ECU. No, the SNiper may not have shipped with the latest. Don't cycle or interrupt power while doing this or you can inadvertently get a firmware mismatch between the handheld and the ECU that will complicate your life. This can also happen if you try to update the FW with the Y-Plug or Laptop plugged in. UNPLUG THEM.What happens when the handheld is plugged in? Anything? Do you hear the injectors cycle when the key is turned on (or in this case, when the pink wire is touched to the battery)?</blockquote>