I have a PowerBook 145B but something is wrong with the systemfolder so it wont boot. I've downloaded System 7.0.1 from Apple and put it on Floppys with my Macintosh Classic. The PowerBook boots from the floppy, after a minute its just white. What to do?

I have a PowerBook 145B but something is wrong with the systemfolder so it wont boot. I've downloaded System 7.0.1 from Apple and put it on Floppys with my Macintosh Classic. The PowerBook boots from the floppy but after a minute it just comes up a window thats completely white.
I've tried a lot of things, but my Macintosh classic (with original floppys) runs 7.0.0. And the PowerBook needs atleast 7.0.1 and did run 7.1.0 as original OS.
How do I fix this?

Because your PowerBook 145B shipped with OS 7.1, it can't run an earlier version of the Mac OS, such as 7.0.1.  Unfortunately, Apple never made OS 7.1 available for download.  You can run OS 7.5.1, 7.5.3, and 7.5.5 on your PowerBook, but I'd recommend doing so with the maximum amount of supported memory - 8 MBs.  The 19-part download of OS 7.5.3 is segmented, so that each one will fit on a 1.44 MB floppy disk.  The problem is that the 19-diskette set isn't an installer set as such, having no bootable disk.  It's solely intended to be used to transfer the individual segments to the resident hard drive in the computer.  Once that's done, double-clicking the first .smi segment creates the OS 7.5.3 installer disk image on the desktop, which you drag onto the hard drive icon.  This produces a folder with the OS 7.5.3 installer in it.  I've done this before with an old Mac LC and it works.  You can also download the 3-diskette OS 7.5.5 Update and run that.  These downloads can be found on the same page where you found the OS 7.0.1 download: Older Software Downloads.

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