Smarty-pants, cc: NM:
I tried your suggestion to download to the flash drive. The drive now has both the zip folder and the BDP-83-18-0402 folder. Hmmn: Shouldn't it be 0406? Anyhow, the result was the same. The player didn't recognize it when I inserted the flash drive, and when I tried to force it via Setup, I got a "Cannot find a valid firmware upgrade" error.
Oh, and another biggie. The first DVD (SD; Carmen) that I tried last week failed to play. Oppo confirmed the issue and said that an upcoming firmware release would address it. Since then, I have mostly been using The Fifth Element and LOTR for SD testing, and we watched one Blu-ray film (Vicki Christina Barcelona). Tonight we tried to watch Stardust (BD). Despite multiple tries, the player simply displays "Loading" for way longer than it should, with a number of whirring sounds, followed by "No disk". This is not encouraging me that the BDP-83 (or perhaps just the unit I have) is ready for my theater, or prime time. Suggestions?