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I wanted to upgrade my old Mid-2010 13" MacBook Pro with a 500GB drive I salvaged from a slightly newer ASUS laptop with a dead GPU, and also wanted to make a sort-of downgrade (from High Sierra) back to Snow Leopard, which is the version that my MacBook Pro came with. I flashed this Snow Leopard ISO onto my USB and followed this guide (Method #3) to do it.

I installed the bigger hard disk, and when I plugged in the USB and booted into the Snow Leopard install disk, the MacBook crashed in 15 seconds after selecting and loading in. Although I figured this was apparently something wrong with the USB, and not with the hard disk as I tried it again with the factory 250GB hard drive in, and saw it crash the same way. But the MacBook still works fine when normally booting in, so that's good.

I used a 32GB Kingston DataTraveler I bought like over half a year ago for the install disk and it works just fine (still does). What do you guys think I should do?

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  • Not sure that "flashing an ISO" is the best way to install. Apple has all the terminal commands you need to create a bootable USB key. And assuming your ISO is a legit copy should work better than the method you so briefly described. support.apple.com/en-us/HT201372
    – Steve Chambers
    Commented Aug 28, 2023 at 23:25
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    According to everymac.com, that model came with OS X version 10.6.3, build #10D2125, which means it can only run that version & build or later. It looks like the image you got is 10.6.0, which won't work. This appears to be 10.6.4, which might work (but it's probably a model-specific build for a different model, so maybe not). See "Snow Leopard Clean Install".
    – Gordon Davisson
    Commented Aug 29, 2023 at 1:18
  • @SteveChambers Not for Snow. The Apple Support article is for more recent OS X. Flashing an ISO is the standard way to go in this case.
    – Gilby
    Commented Aug 29, 2023 at 3:07
  • Or this ISO which is explicitly 13" MBP archive.org/details/mac-os-x-10.6.4-13-mbp. Just have to keep on trying!
    – Gilby
    Commented Aug 29, 2023 at 3:17
  • Rather than use an unverified download of Snow Leopard, I would download the Lion disk image (.dmg) file directly from Apple. You can use OS X/macOS or Windows to create an USB bootable Lion installer from this download.
    – David Anderson
    Commented Aug 29, 2023 at 7:47

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