Here's a few firmware updates for Sony's DRU-510A / DRX-510UL DVD±RW recorders and PlexWriter Premium (-U) & Plextor PX-W5224TA CD-R recorders.

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Sony

Sony DRU-510A DVD±RW - DRX-510UL DVD±RW Firmware 1.0C

Plextor

PlexWriter Premium(-U) Firmware 1.03 Plextor PX-W5224TA Firmware 1.01