![]() ![]() Users of PowerBook 1400 models are advised to skip to Mac OS 7.6 or later. The PowerBook 1400 is specifically not supported by this update. Subsequent Macs with Motorola 68040 and PowerPC processors contained 32-bit clean ROMs. The reason for ending support for these Macs is that future system software releases require at least a Motorola 68030 with 32-bit clean ROMs. Macs with Motorola 68030 processors: (not 32-bit clean) Mac OS 7.5.5 is the last system software release for all remaining Macs based on the Motorola 68000 chips, as well as some other systems. Users of Mac OS 7.5.4 may also directly update to Mac OS 7.5.5.Bug fixes from all revisions to 7.5.3 are included in 7.5.5, making installation of 7.5.3 Revision 2, 2.1, and 2.2 unnecessary. ![]() Users of Mac OS 7.5.2 or earlier must first update to 7.5.3 before attempting to update to 7.5.5.
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