Update required on OS X Mavericks to OS Catalina
Some days before I was lost my Mac OS High, can any body yell me how I do my Mac Book Pro mid 2012 update/ install from a bootable pen drive/ terminal cmd/ OS X Mavericks to OS Catalina
First, you need to upgrade that Mac running OS X "Mavericks" to OS X "El Capitan" or a later version of macOS — which might as well be Catalina anyway.
Follow these instructions: How to download macOS - Apple Support
Then, you can follow these instructions: Create a bootable installer for macOS - Apple Support