Upgrading Pismo boot rom to 4.1.8f5 or newer?

[FacnyFreddy]

I don't see alot of articles on this.

My main pismo has a v3 boot rom

My secondary/test has a v4.1.8f5 boot room and it sees the G4 board just fine.

Any help is appreciated.

 

[FacnyFreddy]

Found the firmware updater out on macupdate.... had to do some hunting. (Apple tech article ended up in the waste bin of the internet and is lost for good)

https://www.macupdate.com/app/mac/5658/apple-powerbook-firmware#

Still getting an odd bit of feedback in system profiler.

 

[belgaonkar]

I know for a fact that the only way to update the firmware on a clamshell is to drop it back down to 9.1 then update it. Seeing that these machines are from a similar era, it maybe similar.

Maybe LightBulbFun can help you out with this, you should probably PM him!

 

[belgaonkar]

check this out: http://comp.sys.mac.portables.narkive.com/zu2ehdUW/os-9-22-pismo-4-1-8-firmware-update

Looks like you will need 9.1 to update the firmware to 4.1.8

 

[FacnyFreddy]

Yup, thats what I had to do.

Install my hacked PRAM battery (which does not currently fit into the brown "blanket" of the bottom case) and let it charge for an hour.

Boot into a fresh 9.1 image and then run the firmware upgrade utility (twice!)

Then I reset the pram, crossed my fingers, and then tested it out.

I pulled the pram battery and installed my G4 board and then loaded a DVD into the drive bay with OS 10.4.11 and everything works PERFECTLY!!!

 

[belgaonkar]

If you have the G4 board, might as well install 10.5!