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After trying to edit the expanded system.img in Linux to add some files & being told not owner, then even with root refusing to edit.. 
I removed the sd card from the orange PC - put in reader on USB in linux.. I could see file system no problem & no problem writing too.. added files and was   -- returned card to Pi   the process corrupted the card.. I really want to be able to do this at the firmware level, extract system.fex - expand to system.img, edit then rebuild -- need to wait a week now as too much time already given 
A bunch of other things I tried too, following guides that I guess were outdated with outdated tools 
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