Thanks to @archje I have not bricked my device. I’d love it if the j7eltexx ROM could be extended to the J730 series.
I just got a Samsung Galaxy J7, however the model is the SM-J730F. The page for j7eltexx indicates that only the 700 series models are compatible, i.e. not the SM-J730F. I don’t want to risk bricking this one!