Everything can be done with a proper treatment, some amount of time, certain skills and knowledge and lots of will

So you are not forbidden to try your best! Just be aware people here including me cannot really help you if something goes wrong.
What I am saying is that it is not a matter of patching something or updating few files or changing a string or too, i.e., it is not reproducible and shareable easily. You may be aware already that some files are specific to your camera, which means, cannot be shared, but only carefully edited with understanding each step and its effect on the camera, and controlling every loop and every branching of possibilities, and adjusting your hacking accordingly. Truly, this is really manual, individual and personal hacking, which is so much unlike "patch and go" hack we have here with E4 - E8+
That's why, I strongly recommend you to find original files from your camera and restore them, and them proceed as advised.
If this is absolutely impossible, try upgrading your camera back to 2.11.0. and re-apply the hacks (modified procedure and files for the 2.11.0). That may not work though, if some of original files is missing. In this case, ROC will persist.
You are on your own here, so take your risk responsibly!