Sry, at work and was in a hurry.
The bulk drive is an OEM drive, with the plain fascia, & retail drives (XL) have "Pioneer" on them, both are recognised as DVR-108.
So there are 2 firmwares, download the correct firmware for your drive and d/click the upgrade.
As for drvupdate, use this if you want to flash with hacked firmware or revert back to an older F/W
And welcome to cdfreaks