I found this OLD late 2010 MBP that came with Lion. The computer works fine and is not locked. There are a few issues though. When I try to do an internet OS restore, it'll just say downloading files and then give me an error, so that's not an option. I did one get it to do a full OS reinstall, but I am not sure if it was because the installer miraculously worked, or it was a DMG iso I burned to a flash drive with TransMac. Because trying to use that same flash drive again won't let me do a clean install. However when I did get lucky that one time and got a full Lion re-install, I come to find out that I CAN'T update to High Sierra or any other OS unless I first get Mountain Lion. But you have to PAY $20 to get Mountain Lion. So I tried doing the same with a Mountain Lion DMG to USB and got stuck. Their disk utility is so much more confusing than Windows. With Windows you just delete all partitions and click next and the OS will get installed. Macs are completely different and complication, and I thought they would be easier. Anybody have an idea on how to successfully burn a DMG to a flash drive either on Windows or Mac disk utlity, and get High Sierra successfully installed, without having to pay Apple $20?