Data and Code upgrade from AX 2012 R2 (CU7) to AX 2012 R3 (CU12)

Hi

Greetings of the day :)

How to do data and code upgrade from AX 2012 R2 (CU7) to AX 2012 R3 (CU12)?

Can anyone kindly suggest me, how to do the data and code upgrade? And which is the best way to achieve this? And provide me any related links.

Thanks in advance.

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