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Has anyone tried to replace the battery themselves? Can someone who has reprogrammed themselves after battery swap reply? Backstory: Dealer is telling me that unless the battery is reprogrammed during installation, the ECU is going to think the new battery is the old one and too much voltage...

Battery in my 2020 Supra won't take a charge, reads 3V. When attempting to jump, I get power to most places. When I hit Start while connected to other vehicle, power flickers intermittently, screen and dash go black, car tries to turn over, barely, but can't. Assuming the battery needs to be...