Your questions:Yes, I used OCLP, though I had already downloaded Ventura installer earlier & it was lying my Applications folder
I'll retry it and have OCLP do the download in case thats the issue
1. Does OCLP retain the SR# of the real mac when it does the install ?
2. Does it do an upgrade on top of my existing 12.7 Monterey or wipe that out with a clean install ?
1. The serial number of the Mac is not affected by OCLP.
2. Read the instructions! The normal way to install and run Ventura under OCLP is to make a USB OS installer, install OCLP to the EFI partition on that Installer, and then boot from the USB HOLDING the OPTION key down at boot, select the EFI icon, and then the target startup disk or the USB installer. Then wipe the internal target disk using the Disk Utility on that USB startup disk. Followed by installing Ventura from the USB. You may need to have a USB 2 hub around, and a wired keyboard and mouse at first.
OCLP only writes to the EFI partition and the NVRAM in order to boot the unsupported Mac. By itself it does not install an OS, it only makes to possible to boot an unsupported machine.
In order to install Ventura (or Sonoma, Monterey or Big Sur) you must 1. boot from a USB installer that has the OCLP made EFI partition on it, or 2. Boot from an installed EFI partition on the internal drive and then the installed macOS system.
You really should read the instructions again, it is obvious that you don't understand the order required to run an OCLP system. See the URL below.
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