I think I also tried to finish the game a few years ago, and a dungeon seemed to have an illogical layout where Link could get stuck in a wall after the transition between screens, or something similar. This made the game unfinishable...
Nice initiative, Dark Link. I can only presume that the dungeons beyond the fatal bug were also hacked and completed. Or were they left to their original state? If it's the former, then maybe the hack was finished, but only had fatal bugs that prevented the players to progress at some point...
I can help with the technical stuff or ROM offsets. I made an editor for the game, so I know the ROM quite well...
To upload files, try
Ze Bucket, it's simpler...