I decided to upgrade a G4 Gigabit ethernet dual 500 mhz, 10.3.8, 1 GB RAM, firmware 4.1.9 with a Gigadesigns original dual 1.33 GHZ processor. The documentation that came with the kit said updating to firmware 4.2.8 was necessary. I downloaded the update from Apple's site using my LAN network on Cable roadrunner. After first running disk permissions repair, I booted to 9.1 and did the firmware update to 4.2.8. It completed with a message saying the install was successful . I rebooted to 10.3.8 only to find that the USB ports and the ethernet ports now no longer work at all. I put in the dual 1.3's and they perform as advertised. huge speed increase, however : still no USB or ethernet. I put everything back to stock : 128 MB RAM, dual 500, empty PCI slots , and etc. Still no USB or ethernet. I zapped the PRAM at least 10 times. no avail. I did CUDA reset, no avail. I pulled the battery, AC cord and pushed the power button, then reinstalled battery and rebooted. No avail. Pulled the battery and left it set overnite. No avail. I have googled and Apple knowledge based till my eyes are bloodshot and my fingers are sore. no avail. All I can find under the problems with firmware updating is with Video and Audio. Nowhere do I find where USB and ethernet stops working after the update. When I try to redo the firmware update, I tells me that I already have 4.2.8 and the installers quits. I have done hundreds of firmware updates but have never heard or experienced this resulting problem. Any ideas. Andy3