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from an employee of a SeC. Haven't seen it by myself. Unfortunately, he didn't had any Information about the processor. Maybe Tesla just run out of Tecra3 SOC's.
The new MCU isn't based on a Intel Processor. The persormance is better than tho original MCU but way beyound the M3.
Retrofitting / upgrade is possible; I've heard they want 2500 Swiss Francs but this includes a new TFT too.