firmware update?

Is there any chance to remove firmware update after it's been installed?Kinda like a jumper in PC motherboards to get default settings.Is there anything like BIOS in macs at all?And if there is one how to access it?
I've got a small problem cus after firmware update on my G3 powerbook vertical brown lines appeared on the left side of the screen.

possably

sexton said:

Is there any chance to remove firmware update after it's been installed?Kinda like a jumper in PC motherboards to get default settings.Is there anything like BIOS in macs at all?And if there is one how to access it?
I've got a small problem cus after firmware update on my G3 powerbook vertical brown lines appeared on the left side of the screen.

Click to expand...

note: i've never tried this myself, but i've herd that it works in some scenarios...

if you can get ahold of a previous firmware version, you should be able to "upgrade" it to that earlier version. as i understand, firmware is not like a driver update, when you update it to a new version, it completely rewrites it. i'd ask around a little more before trying this. as i really don't want you to accidentally kill your mac.