Connect a dedicated battery maintainer or charger capable of supplying a steady 10 to 20 amps. A standard trickle charger is not sufficient. If voltage drops below 11.5V during flashing, the process will fail.
Before altering any firmware, back up your vehicle's factory programming. Open FORScan and click the icon at the bottom left. Turn the vehicle ignition to ON (Engine OFF). forscan pcm update
What specific are you trying to fix with this update? Which OBD2 adapter model do you plan on using? Share public link Connect a dedicated battery maintainer or charger capable
Technical Service Bulletins (TSBs) often require a software flash to fix false Check Engine Lights (CEL) or sensor calibration errors. forscan pcm update