Philip, please be careful. The 320 and 320L are not compatible and someone might take what you say at face value and brick their unit - not a good outcome.
Point 1 - I included the word 320L in my first reply
Point 2 - I already apologized
Point 3 - If DLink would offer updates for some older devices rather than making them EOL / obsolete just because of new models (some of their customers expect devices to last more than a few years)
Point 4 - It took somebody else 4 days to consider giving advice after I had already made an apology .
Suggestion give it a rest or jump in before others who are trying to help don't make silly but understandable mistakes