Julian_mstfh Posted May 26, 2021 Share Posted May 26, 2021 (edited) Issue: reboot at 2nd stage installation this happes exactly at 20% progres bar right after verbose Spoiler IMG_4744.mov so this issue related to nvram because big sur needed native nvram for installation for who dont have native nvram There is 3 method to fix this 1.Install to another machine that have native nvram 2.Fix motherboard nvram but this only aplicable for a few motherboard chipset See here Link 3.(Update install) method this is an update installation rather than clean install we’re gonna use emulated nvram and injecting some patch on that emulated nvram. this fix based from @pac-man thread who facing this issue when updating from catalina and he found a genius trick!! Link All you need: 1.install older mac os first. At least (mojave or catalina) 2.fix emulated nvram as per opencore guide here Link after you fix that emulated nvram the last step 3.adding patch add additional value under [ NVRAM > Legacy shema > 7C436110-AB2A-4BBB-A880-FE41995C9F82 ] Type: “msu-product url” Spoiler after you done type this following command at terminal Spoiler sudo nvram msu-product-url="msu-product-url://$(diskutil info /System/Volumes/Data | grep "Volume UUID" | awk '{print $3}')/macOS%2520Install%2520Data" Shutdown/reboot make sure nvram.plist has created on your EFI partition. And check if “msu-product-url” value has added inside. now you can run install macos big sur.app or update it from system preference after reboot choose mac os install at picker and now big sur installing on your computer and get passed 20%< at progres bar Spoiler Edited June 5, 2021 by Julian_mstfh Link to comment Share on other sites More sharing options...
Julian_mstfh Posted May 26, 2021 Author Share Posted May 26, 2021 3 hours ago, Hervé said: Actually, all this has already been mentioned and solution detailed a long time ago in this thread: https://www.insanelymac.com/forum/topic/345910-unable-to-upgrade-from-catalina-to-big-sur-on-system-with-legacy-bios No credits due to anyone? Yes but i think its more adressed tittle for who facing this issue when perform clean install and yes i forgot to mention credits (edited) Link to comment Share on other sites More sharing options...
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