Pixhawk 2.4.8 Upgrade to Pixhawk 6x standard

Pixhawk
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I bought this flight controller in 2018 and it has been there for a while. Recently, I plan to upgrade it to the latest standards because I need to use drones in school courses.
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So I checked the latest flight control standards on the Internet and bought these two MCUs for reference.

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After spending some time, I completed the replacement of the MCU.