Can't Flash Via SD

[OffUrRcker]

I have an XV600 with a build date of November 2007, and I'm running no2chem's unified kitchen on the MFG 2.40 bootloader. Now, when I format my 1GB card as fat32 with allocation size of 1024, and place any file named TITAIMG.nbh on it, the bootloader won't recognize it.

The sign of an improperly formatted card is "failed to load file," right? Mine simply does not recognize the SD card, it never goes to the flashing screen. This is my 3rd replacement, my 1st and 2nd devices flashed fine, but my 3rd and 4th have had exactly the same problem in that they did not recognize an SD card in bootloader mode. Flashing via RUU is inconvenient, because I have to go bootloader 1.2 to flash a radio, and then it hard resets.

What I'm assuming is the VZW has somehow disabled this capability, though it seems unlikely. Is there something I'm missing? I've tried formatting the card every which way, using nuespl, my computer, and the command line.