[FortoReibas]

That other thread is me too. I did eventually get it reset to defaults via the white reset button and HTTP interface, but that still left me as described in this thread. The admin password is now "admin".

So, to recap:
Log into PuTTY as admin/admin
Navigate to /shares/SHARE1/user_data/
and try to delete subdirectory jrc
with command rm -r jrc
No go.

Try to su as root, but the "admin" password doesn't work for root.

That's where I'm stuck. I need to be clear that I really don't care about root -- it's just a possible method to allow me to delete a subdirectory, which is what I really want.