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[Guide] Big sur reboot at 2nd stage installation fix


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Posted (edited)

Issue:

reboot at 2nd stage installation

this happes exactly at 20% progres bar right after verbose
 

Spoiler


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 shema7C436110-AB2A-4BBB-A880-FE41995C9F82 ]

 

Type: “msu-product url”

Spoiler

B0835F5F-D056-4FA1-8050-AB91FE7A1D24.png.2294eb90c6699b90d5277a54f1a9755b.png


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

FAC2BE0C-58AF-492E-B589-0C65F9ABC5FD.thumb.jpeg.c769cb09ed99f86be0ef5b9e96c7b567.jpeg

 

 

Edited by Julian_mstfh
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)

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