Home › Forums › Macs › Desktops › Mac Pro › OpenCore › Reply To: OpenCore martinParticipant9th February 2022 at 1:49 pm#1417518Thanks for all the great info on this forum. I’m running Big Sur now for a few months and it’s working great. Can I just upgrade your OC with the latest Martin Lo package in order to upgrade OS from Big Sur to Monterey? This would be on an internal HDD that I can boot into Big Sur. I also have an internal Big Sur SSD which is my main boot drive. Rather not mess with that until I can confirm success on the HDD. Additionally I have a pci ssd running Mojave. Would not want to lose that.thanks for any insight…