Firmware Redeploy (Lead Acid Battery)

Remove the rear underhood apron. See UNDERHOOD APRON - REAR (REMOVE AND REPLACE)
Connect a LV battery maintainer to make sure power is not lost during the software reinstall.
CAUTION: If using a 50A or 80A maintainer, make sure the maintainer is set to "Lead Acid" or "Half Power" mode. Failure to do so could damage the LV battery.

Courtesy of TESLA, INC.
Connect a laptop with Toolbox 3 to the vehicle. See Toolbox 3 - Connect and Disconnect .
NOTE: Locally connecting the vehicle to Toolbox 3 will automatically enable Service Mode Plus.
In Toolbox, select the Actions/Autodiag tab, and then search for "redeploy".
Run the appropriate routine and wait for the reinstallation to complete. Reinstallation status can be monitored on the vehicle touchscreen.
- Service CAN Redeploy (UPDATE_CAN-REDEPLOY) - A "partial" software reinstallation that reinstalls the currently installed software package to all module, ECU, and component replacements, with the exception of the car computer.
- Service Redeploy (UPDATE_SERVICE-REDEPLOY) - - A "full" software reinstallation that reinstalls the currently installed software package to the car computer, and all module, ECU, and component replacements.
Once the reinstallation is complete, check that the release notes appear on the touchscreen, indicating a successful reinstallation.
Disconnect the LV battery maintainer.

Courtesy of TESLA, INC.
Disconnect the laptop from the vehicle. See Toolbox 3 - Connect and Disconnect .
Disable Service Mode. See Service Mode
Install the rear underhood apron. See UNDERHOOD APRON - REAR (REMOVE AND REPLACE)