How to deinit/init a some built-in functions?

[DK.7]

How to correct to deinit a some built-in functions and, after my edits, initialize it again?

For example, on this function "void MX_LWIP_Init(void)".

[Piranha]

You don't need to deinitialize the whole IP stack to change MAC, IP addresses and even network interfaces and similar parameters.

Some examples:

https://community.st.com/s/question/0D53W00000zHH9PSAW/changing-ip-address-mac-address-during-runtime