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MCU1 upgrade to MCU2 - Can I now record review Camera?

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...Only has review camera, no sentry mode. Does anyone know if this upgrade will allow recorded of review camera?

Interesting!

My guess: Since your 2015 is HW1 that only use the single front camera and does not use the rearview camera and it does not have other surrounding cameras, I guess no Sentry Mode and no Rearview Camera recording make sense.

Your HW1 rearview camera is dedicated to human use and none for the Automation system at all.
 
I can 100% confirm that MCU1 upgrade to MCU2 itself does not give you Sentry features if you don't already have the feature or the hardware. I upgraded my 2015 S70D recently. Only additional entertainment features like Netflix and my original missing 4GLTE is included. And you will loose FM and Sirius radio features. To me, the upgrade is worth it because the new MCU performs much smoother and faster.
 
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