uefi mod for mac pro 1.1/21. support xeon 54xx

[victorgbrmrr]

hey guys . Will the mod be possible? I know I might have to make changes to the hw but that wouldn't be a problem. I would like to know if anyone knows how the Mac 1.1/2.1 firmware could be modified. including the cpus support that mac 3.1 supports. Is there a tool for this, could someone help me? Any ideas are very welcome.
mac 3.1 is very similar to 2.1, which by the way is identical to 1.1.

[DeathBringer]

Apple firmware can't be modded.

[victorgbrmrr]

Apple firmware can't be modded.

Seriously, is it impossible to do this?