Mac OS: Matching Mac OS ROM File To Mac OS Version

Your computer must have the appropriate Mac OS ROM file for the version of Mac OS that is installed. Using the wrong Mac OS ROM file can cause the computer to behave unpredictably and may even prevent it from starting up.

The chart below matches the applicable Mac OS ROM file to the applicable Mac OS.

Mac OS	Mac OS ROM Version
Mac OS 8.1 (iMac, Rev A Bundle)	1.1
iMac Update 1.0	1.1.2
Mac OS 8.5 (Retail CD)	1.1.2
Mac OS 8.5 (iMac, Rev B Bundle)	1.1.5
Power Macintosh G3 (Blue and White) Mac OS 8.5.1 Bundle	1.2
Macintosh Server G3 (Blue and White) Mac OS 8.5.1 Bundle	1.2
iMac Update 1.1	1.2.1
Mac OS 8.5.1 (Colors iMac 266 MHz Bundle)	1.2.1
Mac OS 8.6 (Retail CD)	1.4
Mac OS 8.6 (Colors iMac 333 MHz Bundle)	1.4
Power Macintosh G3 (Blue and White) Mac OS 8.6 Bundle	1.4
Macintosh PowerBook G3 Series 8.6 Bundle	1.6
Mac OS ROM Update 1.0	1.6
Mac OS 8.6 bundled on Power Mac G4 (PCI)	1.7.1
Power Mac G4 ROM 1.8.1 Update	1.8.1
Mac OS 8.6 bundled on iMac (Slot Loading)	2.3.1
Mac OS 8.6 bundled on iBook	2.3.1
Mac OS 8.6 bundled on Power Mac G4 (AGP)	2.5.1
Mac OS 9.0 bundled on iBook	3.1.1
Mac OS 9.0 bundled on Power Mac G4 (AGP Graphics)/ iMac (Slot-Loading)	3.1.1
Mac OS 9.0 bundled on PowerBook G3 Bronze	3.0
Retail Mac OS 9.0 installed on iMac	3.0
Retail Mac OS 9.0 installed on Power Macintosh G3 (Blue and White)	3.0
Mac OS 9.0.2 bundled on Power Mac G4 (AGP) and iBook	3.5
Mac OS 9.0.2 installed on PowerBook (FireWire)	3.5
Mac OS 9.0.3 bundled on iMac (Slot Loading)	3.6
Mac OS 9.0.4 Retail/Software Update	3.7
Mac OS 9.0.4 installed on PowerBook (FireWire) (Summer 2000) (CPU software 2.4)	3.7
Ethernet Update 1.0	3.8
Mac OS 9.0.4 installed on iMac (Summer 2000)	4.6.1
Mac OS 9.0.4 installed on Power Mac G4 (Summer 2000)	4.6.1
Mac OS 9.0.4 installed on Power Mac G4 MP (Summer 2000) (CPU software 2.3)	4.9.1
Mac OS 9.0.4 installed on Power Mac G4 (Gigabit Ethernet)	4.9.1
Mac OS 9.0.4 installed on Power Mac G4 Cube (CPU software 2.4)	5.2.1
Mac OS 9.0.4 installed on iBook (Summer 2000) (CPU software 2.5)	5.3.1
Mac OS 9.0.4 installed on Power Mac G4 (with Radeon) (CPU software 2.6)	5.5.1
Mac OS 9.1 installed on iMac (Early 2001)	7.5.1
Mac OS 9.1 installed on iMac (Summer 2001)	7.5.1
Mac OS 9.1 installed on Power Mac G4 (Digital Audio)	6.7.1
Mac OS 9.1 Update	6.1
Mac OS 9.2 installed on iMac (Summer 2001)	8.3.1
Mac OS 9.2 installed on Power Mac G4 (QuickSilver)	8.3.1
Mac OS 9.2.1 Update	8.4
Mac OS 9.2.1 installed on Power Mac G4 (QuickSilver)	8.4
Mac OS 9.2.2 Update	8.7
Mac OS 9.2.2 installed on iMac (Summer 2001)	9.0.1
Mac OS 9.2.2 installed on iMac (Flat Panel)	9.0.1
Mac OS 9.2.2 installed on eMac	9.2.1
Mac OS 9.2.2 installed on Power Mac G4 (QuickSilver 2002)	9.0.1
Mac OS 9.2.2 installed on PowerBook G4 (12-inch)	Classic only. Cannot start up in Mac OS 9.
Mac OS 9.2.2 installed on PowerBook G4 (17-inch)	Classic only. Cannot start up in Mac OS 9.
Mac OS 9.2.2 installed on Power Mac G4 (FW 800)	Classic only. Cannot start up in Mac OS 9.
Mac OS 9.2.2 installed on iMac (17-inch Flat Panel)	9.5.1
Mac OS 9.2.2 installed on iMac (17-inch 1GHz)	Classic only. Cannot start up in Mac OS 9.
Mac OS 9.2.2 installed on iMac (USB 2.0)	Classic only. Cannot start up in Mac OS 9.

Note: The parenthetical product descriptions (Summer 2000) and (Summer 2001) refer to the summer of the Northern Hemisphere.