I tried this with an audio CD and it worked (and is free as long as the resulting CD is 300MB or less), so here's what I did...
You need to copy the Onkyo-provided CD to two files: a BIN file and a CUE file. There's a shareware program called "PowerISO Maker
" that will let you do this very easily and for free (using the trial version). PowerISO will also let you burn the BIN/CUE files to disc for free as long as they're smaller than 300MB.
Anyway, here's how you'll convert the Onkyo audio CD to two disc image files:
Once you've installed the software (don't worry, it's legit), click on the "Tools" menu, then click on "Make CD/DVD/BD Image file..." Make sure you've already inserted the Onkyo disc in your optical drive, and select that drive from the "Source drive:" drop-down menu. Since it's an audio CD that you're trying to make an image of, the software will default to a BIN-formatted output. Click on the "..." button, select where you want to save the image, type a filename ("onkyo" seems appropriate), and click "OK." That's it! It takes a minute or two to create the two files (onkyo.cue and onkyo.bin), but that's all you should have to do.
Once you're done, you can email me the files and I'll post them for others to download. TIA and let me know!
Also, if you can get the BIN/CUE files generated, we'll also need the procedure for actually updating the receiver. Is that posted somewhere already?