First post here - so please go easy on me - I'm also relatively new to vintage macs...
I recently acquired a Mac LC475. Having been cleaned, re-capped, PRAM battery fixed up - and the case glued where needed it's now ready to go. It had a collection of random, non-working stuff on the drive (running System 7.1) - so I thought I'd re-format it and put macOS 7.5 on there - as that seems to be about "peak" for this machine from what I've read (or maybe 8.1?).
The machine has also been "chipped" by the previous owner taking it from 25Mhz to 33Mhz. As such the "About this mac" dialog now just says "Macintosh" instead of "Macintosh LC475" (which is I think where my trouble lies).
I have a CD-ROM drive for the machine - and managed to download one of the Apple Legacy Restore CD's - this boots fine, but I can't install anything older than 7.1 - as all later versions pop up with "Installer script does not recognize this Macintosh. Please use the original ..."
I'm guessing this is because it's looking at the machine ID - and not finding anything it recognizes any more so won't install. System 7.1 does install - but none of the updaters to newer versions run either.
I'm also aware of the "Wish I were" utility - to fix this is it going to be as simple as booting from the CD, running Wish I were from floppy - and re-picking the LC475 - then running the installer?
If not - is there anything I can do to bypass this check?
I've looked around both these forums - and the net, and not really found a lot of info about it. In fact, there's comparatively little info about older mac's floating around - so it's great I found this place!