Thanks delta.kilo
From the OBI Device Admin. Guide: "To restore an AA prompt file onto an OBi, do it exactly like a firmware upgrade via the web browser but provide the device with the prompt file instead of a firmware file."
I had read that a couple times recently, but it never quite registered ... I kept trying to use the "Restore Configuration" field. It is not really logical to use the "Firmware Update" field.
When I had restored prompts a couple years ago with an earlier version of the firmware, I must have been paying closer attention ... anyway, thanks for responding.