Following instructions are provided without any warranty, and may even get you in trouble legally. The instructions are provided for testing, learning, preventing e-waste, and should be use with care. We (including contributers + commentators) are not responsible for any damage to your device(s) or any legal issues.
Instructions have been moved to https://github.com/francoism90/asus-router. :)
@Euri007 No worries, you can also reset your router, and you'll have the default values again. It's also recommended to do so after switching firmwares.
I don't know that fork, but you should be able to simply reset using the router interface.