Update: firmware tool LtnFW wouldnt write back the bin to the 16P9S. It just locked up the prog. Drive is OK though.
I also have the same "problem" of sorts with 1673/1693S/800A. LTNFlash hangs at 100% when writing firmware to drive and WILL NOT finish. I have found though, that if you keep the drivebay open (if you don't feel comfortable doing this, then DON'T) and flash with LTNFlash with above drives, it WILL UPDATE :iagree: . LTNFlash still remains at 100% and doesn't finish off with "Done" as per normal, but I can confirm it does work. Naturally, if writing back same firmware LTNFlash looks as though is just stuck at 100% but watch the drive light also. It will go through usual flashing routine. If you use a different firmware new drive or firmware will be reflected when drivebay closes after flash. Once again, if you don't feel comfortable in doing so, DON'T. I don't have the new SOHD-16P9S, so I can't test for this drive myself.