The Power Macintosh G3 Firmware Update version 1.0.2 should be installed on all blue & white Power Macintosh G3 or Macintosh Server G3 systems. Features delivered with this update include improved performance of PCI devices including built-in FireWire ports, improved support of NetBooting, and minor improvements to Open Firmware for Mac OS X Server. Instructions are available in English, however, this updater will work on all worldwide systems.
You can download this firmware update at Apple's software updates section. This is a direct link to the firmware page.