So when you power off and then power up does the iRiver go through the same sequence and stop with the ATA -32 error? Or is the player just dead? If you power up while pressing the record button (upper RHS button) does it boot into the original firmware? Try removing the drive and see if you can boot into the OFM (should come up ATA -1).
If none of that is happening then you may have a bricked player.
If you can't get communication with the drive with your PC, look at getting a 1.8" IDE to USB connector like the one pictured. Cost is $4 plus postage. At least with this you can test if your HD is working and you will be able to get control over the files on the drive.
I don't understand what you mean when you say "... when I let Rockbox from the (now broken) HDD run swapped HDDs". Can you tell us, step by step, what you did and what went wrong.
Yeah exactly what you described there. The OFM does not load even when pressing both Rec and Start button at the same time and neither does it show up when removing the drive, it loads into Rockbox again, shows a ATA -11 error. Might have destroyed my player when I did this
(explaining that phrase you did not understand):
So I attached the old drive (which had damaged blocks was barely working then) to my PC and let Rockbox v 3.13 start on it, then while rockbox was still on, I removed the iRiver from USB and also removed the old drive and put in my new one and connected it via USB, that was the only way the new HDD would be recognized by Windows, was really shit. I guess since I changed the HDD's so many times to get Rockbox working I somehow destroyed a piece of the ATA/USB connection there.
There is no data on the new HDD that has to be restored btw, thought I let you know this, all I want is this iRiver to work again, but I think I have to stop dreaming of that now..