MP 1,1-5,1 Mac Pro 1.1 Firmware update

[joe10190]

Hi,

I have a Mac pro 1.1 that has been running El Capitan for a while. It seems stable.

I have now upgraded the cpus to 2 x X5355.

Boot Rom Version MP11.005C.B08 SMC 1.7f10

I have tried to upgrade the firmware 2.1 and it failed on the El Capitan install.

I also tried an install of Lion and followed the instructions on this thread


https://forums.macrumors.com/threads/mac-pro-1-1-firmware-upgrade-issues.2174741/page-2

Still no joy!!!!!!!!!!

Do I need to update the SMC to make sure the machine is stable?

Thanks

Darrell