Home › Forums › Macs › Desktops › Mac Pro › OpenCore › Reply To: OpenCore neemasaedianParticipant10th February 2022 at 2:17 pm#1417559martin wrote:Thanks 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…Martin are you able to chat about your process? I’m stuck and would love to get over this issue once and for all. Please advise