In that case, I would try to redownload the installer and the steelhax payloads again. Once in there the main rop and code dot bin files should be left and just remove the payload file in there and place the one you have for your firmwareand when its just black and gets too home menu?(just for ask)
https://gbatemp.net/threads/steelhax-a-steeldiver-subwars-secondary-entrypoint.440673/