Hi! I’m not at all a developer, and it’s a friend who remotely guided me through the process. So before trying to answer @ff2u questions and before trying to understand the content in the link you shared (which I’m both grateful for, but are both gonna take time for me to wrap my head around them), I’ll answer your first question “Is it possible you are actually failing at an earlier point than you think?”, where I think the clue might be. I’ll explain:
When we were at that point :
My friend believed that as we did the EOM unlock steps on the phone, we didn’t have to do the command line part. But I had my doubts about that. That’s why I asked about it in another post. And it seems that @AnotherElk confirmed my doubts.
So could all the problem come from the fact that we didn’t do the EOM unlock steps both through the Developer Options (on the phone), and through the command line (on the computer) ?