What is the current situation? I can't understand it, you say you can't login, but you are posting here. How is that possible. Do you have another mac, aside from the old iMac? I hope I am wrong, but I suspect you will not be able to access that Catalina "Patched" volume and wind up having to wipe it using a USB install disk. Can you make a USB install disk using OCLP and do you already have an Apple installer downloaded? I can't remember what system you need to upgrade to to get that software you need running, but on that old hardware Big Sur would be much easier to install and work with.Thanks david lv, would love to reply to the bulk of what you wrote, very helpful. (One thing though, by Catalina Patcher, I simply mean the Catalina volume installed by way of the DosDude Patcher).
But since I last posted, just as a test, I made the mistake of using CCC to clone back the CCC data volume on the external to the data volume on the High Sierra Desktop -- never touched System. Thought that this would be completely harmless, but doing this appears to have corrupted the data volume, and since then I've been unable to boot back into the Catalina -- have spent the last 4 or 5 hours in deep **** looking at loading bars which take forever to finish, and which never result in a boot.
After trying any number of things, was desperate enough to do a Catalina reinstall from the USB stick, which I thought might be the solution.
Present situation is that at least I now get the Catalina login, but I'm prompted to enter name and password (previous login just asked for password). Have tried the user and password set before all this happened, but they just bounce and are rejected, no idea why.
Screenshot is from this thread,
https://apple.stackexchange.com/questions/388686/stuck-with-name-and-new-and-enter-password-prompt
I've tried a few of the suggestions from that thread, including rm /var/db/.AppleSetupDone (AppleSetupDone not found), but none of them work.
View attachment 2143245
Have spent the last several weeks fine tuning the Catalina volume -- had it working just fine (mostly) -- but right now it looks like all of that work is down the drain. So deeply sorry that I have to ask this now -- Again I realize that this has nothing to do with Ventura -- but I'm wondering if you or anyone else here might have something to offer for this present login dilemma.
Assuming you have access to the old iMac, the latest Big Sur installer is available here;
macOS Big Sur Full Installer Database. Download Directly from Apple!
You can now download Beta & Final versions of macOS Big Sur 11 my new database! Every available version of Big Sur listed for quick download!
mrmacintosh.com
After the new system is installed, you can copy your Data and Applications back to the internal disk.
Don't use CCC unless you really understand what it does!