Downgrading New World Roms?

[zarky]

I need to downgrade the rom/firmware on my powerbook pismo, is there a way to do so?

 

[greystash]

I need to downgrade the rom/firmware on my powerbook pismo, is there a way to do so?

I've done this with my MDD and wrote about it here. I'm not sure if the steps will be exactly the same, but be very careful and only do this if you have to

 

[zarky]

Thank you, i need to roll back the firmware on my Pismo because the macos9lives 9.2.2 installer put the 10.2.1 firmware on it and now my firewire doesn't work. So I want to roll it back to 4.1.8, the last pismo firmware.

 

[zarky]

theres a chance i'm not understanding something, info seems hard to come by these days on your search engine of choice.

ROM revision: $77D-45F6
Boot ROM Version: $0004.18F5
Mac OS ROM file version: 10.2.1

Looks like my boot rom is already 4.1.8? And OS rom is 10.2.1... Is this even the source of my firewire issue? Im at a total loss at the moment.

 

[greystash]

theres a chance i'm not understanding something, info seems hard to come by these days on your search engine of choice.

ROM revision: $77D-45F6
Boot ROM Version: $0004.18F5
Mac OS ROM file version: 10.2.1

Looks like my boot rom is already 4.1.8? And OS rom is 10.2.1... Is this even the source of my firewire issue? Im at a total loss at the moment.

Yes that appears correct.
- "ROM revision" I believe is the revision of the boot firmware located on the Pismo's ROM chip.
- "Boot ROM Version" is the boot firmware version of the machine.
- "Mac OS ROM file version" is the version of the Mac OS ROM file located in the System Folder.

I don't think any of the pre-built Mac OS 9 Lives images come with any firmware installers/updaters.

I can't remember if the Mac OS 9 Lives installers have a modified Mac OS ROM file or not. But it may potentially be what you would want to look at changing if you've installed the OS from a Mac OS 9 Lives CD? If you reinstall the system with an original disc for the Pismo, or from a Mac OS 9 Universal installer this will install the correct Mac OS ROM file for your machine.

Unless you ran a firmware update it's unlikely you need to do anything with the Firmware.

 

[zarky]

yeah thanks, guess i got caught up in a bit of a red herring and kind of misunderstood what was going on.