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2017 MX 100D - MCU1/AP2 but no FSD - should i do FSD first?

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So confirming then that MCU2 upgrade includes all the AP3 pieces as well even if you have not bought FSD prior to upgrade? I.e. when you decide to do FSD upgrade down road, you'll have all the HW and no need to revisit SC
Yes that is correct. MCU 2 upgrade in car with AP2 includes AP3 computer as well. They will not change the camera or any other sensors. AP3 computer is capable of handing those hardware. FSD is is just the update after you have the hardware in place.