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Lycestra

macrumors member
Oct 1, 2018
56
38
Cheesy Midwest
Hi I'm new here👋🏾. but i wanna get straight to it. I recently updated my wifi/bluetooth card "Airport Card" to
802.11ac + Bluetooth 4.2 for Unibody MacBook Pros from here :https://subtle.design/products/80211ac/

will this work with no walk arounds? i could do some testing if you guys are interested. LMK😎

Probably will work without workarounds. I have a Mac Pro 2009 (4,1 flashed to 5,1) with an aftermarket upgrade to an official internal ac/4.2 wireless board, and it uses the AirPortBrcmNIC driver. The factory wifi for a 4,1 system uses a 4331 driver, which I had to copy in from Mojave for Catalina to work. Now I can use stock Catalina. I'm not sure if the BT4.0 card uses the 4360 (driver still present in Catalina), but the 4.2 chipset should be good for Big Sur support.
 
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timthomason

macrumors member
Jun 28, 2018
85
109
This is a small guide I wrote earlier for people on the "macOS on unsupported Macs" Discord server. I followed these steps and got a working and stable install on my MacBook Pro 9,1 (mid 2012 15 inch), but without Wi-Fi support for now.

1. Download pkg from http://swcdn.apple.com/content/down...kxzj3zjshu1srsh4n74a41n4/InstallAssistant.pkg
2. Download https://forums.macrumors.com/attachments/really-simple-installer-hack-zip.926156/
3. Copy hax.dylib to home folder
4. Boot into recovery
5. Run csrutil disable in Terminal
6. Reboot and run this in Terminal while on current OS - sudo defaults write /Library/Preferences/com.apple.security.libraryvalidation.plist DisableLibraryValidation -bool true
7. Run this in terminal launchctl setenv DYLD_INSERT_LIBRARIES $PWD/Hax.dylib
8. Open the InstallAssistant.pkg and open the Installer.app in Launchpad / applications folder
9. Wait for install to finish
Final step (only required if trying to boot on machine older than Mid 2012 (?)) - on Catalina or other OS that can access your APFS partition, delete telemetry from /System/Library/UserEventPlugins/com.apple.telemetry.plugin when complete.
just wondering if running dosdude1 installer for 10.15 would install the wifi support?
 

jackluke

macrumors 68040
Jun 15, 2018
3,321
8,068
For those as me that are playing in adding patches (Wifi, Audio and so on) and kext to the new BigSur "prelinkedkernel", I advise first to take a backup of the original kext that you are replacing, and second when you have a BigSur working desktop on unsupported machine take an entire backup of this folder: /System/Library/KernelCollections/

because if something goes wrong, without "kextcache or kmutil" working from BigSur single user mode, it's very hard to recover a valid kextcache, unless you re-install completely BigSur.

edit:
in theory there is also this other path to consider /Preboot/UUID-lettersnumbers/System/Library/Prelinkedkernels/

and this (from BigSur APFS Data Volume) /Library/KernelCollections/AuxiliaryKernelExtensions.kc

and this: /Library/Apple/System/Library/Prelinkedkernels/prelinkedkernel
 
Last edited:

ggkameleon

macrumors newbie
Nov 20, 2014
16
3
Hi ! For my mac mini 2012 16go ram & ssd do stay stable for update it on unsupported mac or install beta. But after for update ?
Thanks
 
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Jack Rawlin

macrumors newbie
Jun 23, 2020
1
6
so that machine lacks that instruction set
the 2013 iMacs support AVX2, this image shows the 4570r which is the 2.7GHz i5 In the 21inch iMacs at least, the 2.9 ghz should be the same I can't see why not
1592925543370.png
 

Kriter

macrumors newbie
Jun 23, 2020
8
11
I have the same problem:

mount_apfs: volume could not be mounted: Permission denied
mount: / failed with 66


I did both an upgrade from Catalina and then a clean install.

Apple must have put in new security measures.


Yes
[automerge]1592921887[/automerge]


If you updated a previous Catalina maybe the main user has been converted to standard user not admin.

Or you used a previously converted from hfs to apfs Volume disk that is different from erasing a new volume in apfs.
 
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Kriter

macrumors newbie
Jun 23, 2020
8
11
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jackluke

macrumors 68040
Jun 15, 2018
3,321
8,068
Already try disabling SIP, but tried it again and also the nvram args from that post.



still no luck, root doesn't have write privileges on "/" from what I can see.

sh-3.2# mount -uw /
mount_apfs: volume could not be mounted: Permission denied
mount: / failed with 66

Check from BigSur System Preferences if your main user has been converted to standard rather than admin, because during this patched installation sometimes the user permissions are not set correctly for the root user.
 

jackluke

macrumors 68040
Jun 15, 2018
3,321
8,068
Ok after install and reboot it now get the forbitten sign? so it dont want to boot. i have a mac mini late 2012 what shall i do ?

You should try this: https://forums.macrumors.com/thread...unsupported-macs-thread.2242172/post-28592102

because the BigSur post-install apple scripts clear the nvram and re-enable csrutil.

Anyway I have used a different method, I use opencore as boot loader that's why I don't care much of that, this setup I use: https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/post-28551389

If you want to test that you can install it near a BigSur installation or installer.
 

libneko

macrumors member
Jun 22, 2020
62
165
Siberia
Check from BigSur System Preferences if your main user has been converted to standard rather than admin, because during this patched installation sometimes the user permissions are not set correctly for the root user.
Doesn’t work for me, user is Administrator in system preferences, OS installed on separate Volume, but in the same APFS container. Could that be a reason?
 
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jackluke

macrumors 68040
Jun 15, 2018
3,321
8,068
Doesn’t work for me, user is Administrator in system preferences, OS installed on separate Volume, but in the same APFS container. Could that be a reason?

Maybe is that, because in my BigSur "sudo mount -uw /" is correctly working I can replace any System folder files.
[automerge]1592927866[/automerge]
Also, device is Fusion Drive

I guess that's the issue then.

But how do you installed BigSur on fusion drive ?
 
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