You got the tencent model and he has got the international one. You probably have gone through a fair bit of playing around with the working files in the phone to convert your firmware. so you probably won't feel as...apprehensive as him ?
Still I wouldn't dare. I would like to try those actions first on some old device to get a hang of it. Doing something for the first time is always a risk. After some practice I could do it also on a new phone. But I expect Asus will some day do it for me and provide me with VoLTE. But of course this is just my opinion.
