Hello i just wanna make some liveries for the a320nx but I don't know how, so can someone please help.

How can i make A320neo flybywire liveries?
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Not sure I understand the question. Do you want to make "default A320NEO into FBW" or vice versa?
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No, I think he wants to know how to make liveries for the A32NX. Have a look at this: https://docs.flybywiresim.com/dev-corner/texture-changes/ and this https://docs.flybywiresim.com/fbw-a32nx/liveries/