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Same here about to do this also......

2019.12.1.1 4b1dd29 04/30/2019 6:12 PM 3 Anyone else remember, this was suppose to be the update that increased supercharging speeds?

Most likely you will not be able to root your car. Right now everything after 2019.20 is not rootable as far as I know.

What version is your car on for software? What version is your car on for software?

I am sure you would support it if your car lost 30 miles overnight, takes longer to charge, and lost acceleration performance.

Do you know your battery cell voltage at 100%? We need to know if that went up some with the update.

Correct but the car is set too sensitive to a drop in voltage, that is the issue here. They do not account for the real world. I am a electrician, there is no issue on my end, it is just that tesla has the parameters wrong.

I live in the sticks, voltage is high but drops when a load is applied. It is amplified by the fact my service and shop are far apart. I drop of a few volts triggers the car to reduce from 40a charging to 30a charging. Voltage drop from wires is within 3%.

This charging voltage drop to protect UMC sucks. My shop is 200' from my service on the house, of course there is going to be voltage drop. So now I am stuck with 30a max charging.

Lots of info here. Thank you for doing the research to help us out to understand this better.

Very interesting, are there any youtube videos explaining this more, and or cars driving with this?

If you have a rooted Tesla, DO NOT take 12.1.1! It broke my root, and now I can't supercharge.