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Tesla states 2019.40 is needed but mine on 2019.32.2.1 continued to work with the app after the update deadline. My understanding is that my fw version has both Hermes websocket vpn and openvpn both in the build.
U should stay on the software your on if you update the car I bet you will have a bms issue and that will kill your car because tesla knows your car is salvaged or may have free charging and they can't let that happen because they want all your money