There is no existing hack that works for Instanity FlyFF, there might exist one but it sure haven't been released.
Nevertheless, when looking for a released hack you should use the search function and not make a thread like this asking a question you can figure out yourself.
You can make your own hack, but it requires time and skills. If you don't have those 2 criterias, you'll have to wait until another hack working for Instanity gets released.
There are multiple users you can buy hacks from, that isn't released. Buying a hack will make it better, as it's hard patching the hack as the files haven't been released. Basically, buying a hack that haven't been released for public is undetectable on most servers.