How hard can it be using a Hex Editor?
Here: download this one cuz is the one i use
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I don't have the latest version but it should work the same way:
Once the program has been installed open it and it should show a window like this one, then select file>open>open file and select your Maplestory.exe
Once it's opened then go to the adress 006fe079 i put above in this box and click enter:
View attachment 240272
See where the Mouse Pointer is? There is where the IP adress is, then all you have to do is click on the first number of the adress and put yours, wich in this case is 127.0.0.1
Aside Note: in case you see the same adress being repeated 3 times then you have to change all 3 of them, i'm not sure if it's totally necessary but if i were you i would do it, like this for example.
View attachment 240274
Once you're done save the file and done.
By the way, something important i feel i need to mention.
The Dots between any ip adress is represented in the Hex Editor by 2e instead a 00, so in case the original IP adress is much longer than the 127.0.0.1 one then you must fill the rest with 00 in the Hex Editor. Example:
View attachment 240275
You have to make sure the Dots between the adress numbers are represented by 2e and the rest outside the adress by 00.
Hope this helps you.