pmars, welcome to the forums. You may not be getting the response you're hoping for as you're posting this in the wrong forum--yeah, that's not obvious as this is the firmware forum, but the policy is to post questions in the vendor specific forum if there is one. That would leave the firmware forum for whatever stuff is leftover. If I'm not able to help you out, you might try over at: Asus/Pioneer
It sounds like what your problem is that you flashed a 112D (custom firmware) to a 112 (stock firmware) and now you're trying to flash it to a 112D (newer stock firmware). Correct?
The first time, you did what's called a 'crossflash' where you change the model of the drive. If you want to upgrade the firmware of your, now, 112 drive, you'll need the v1.28 files for a 112. From the names of the files you have, you've got the stuff for v1.28 of the 112D. I can't check the files you mentioned specifically--as I converted my 212D to a 212 (note the 2xx meaning SATA vs 1xx being PATA), so my files are named differently. But, that being said, I think your problem is in using UPR12D.exe instead of UPR12.exe (or similar).
I hope that helps you in the right direction. If not, come on over to the Asus/Pioneer forum and someone else will likely lead you to what you're looking for.