So, I could return this device, find a new 3DS in the box that has 9.2, then I could setup cfw and install whatever games I want? Yes with the Old 3DS or 2DS not the N3DSXL model if you want a N3DSXL you can use this thread to find one though it's become very difficult http://gbatemp.net/threads/n3ds-xl-firmware-by-version-number.381479/
How do I find games in CIA format? I cant mention or link the site directly but try
searching google for 3DS ROMS the 4th link is what your looking for and go to the CIA section.
Are they installed to an SD card? Yes once installed you can delete the CIA from the SD card.
Yes but it's become very difficult try searching in the more poor sections of your city/state since those models on the shelves are likely to be from the first run. If you cant find one just get a NIB 3DS/2DS or buy used by checking the firmware first.So I could get the new 3DS model as long as it is one of the serial numbers that means it is 9.2 or lower and the cfw will work?
Yes but it's become very difficult try searching in the more poor sections of your city/state since those models on the shelves are likely to be from the first run. If you cant find one just get a NIB 3DS/2DS or buy used by checking the firmware first.
Unless you made a NAND backup while on 9.2 and lower no you cannot downgrade.Is there a way to downgrade my device instead of returning and buying a new one?
He has purchased the one I recommended alreadyAlso, the answer for DS games is that you need a DS flashcart. Most DS flashcarts are blocked on newer firmware, but if you have a hackable system (9.2 or earlier) you can unblock them.