Don't need to unplug anything to update the firmware on sd card. Just go to menu, and scroll down to firmware update and follow the steps. But you can unplug the ultra and the fresh start will automatically check and update firmware. Now if your talking about getting the egt to read, I think it is unplug obd and egt sensor. Plug egt sensor in first, then obd back in second. I think! Then it should read. The obd is the big plug under dash they use to read ecm, flash, ect.
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