Cannot mount system read/write

[q64ceo]

Howdy, y'all!

Trying to change a few Dock icons and need to mount Big Sur in read/write mode. For some reason or another it isn't working.

I put these commands into the terminal

root@notsures-Mini ~ # csrutil authenticated-root status

Authenticated Root status: disabled

root@notsures-Mini ~ # csrutil status

System Integrity Protection status: unknown (Custom Configuration).

Configuration:

    Apple Internal: disabled

    Kext Signing: disabled

    Filesystem Protections: disabled

    Debugging Restrictions: disabled

    DTrace Restrictions: disabled

    NVRAM Protections: disabled

This is an unsupported configuration, likely to break in the future and leave your machine in an unknown state.

root@notsures-Mini ~ # mkdir /Volumes/macOS1

root@notsures-Mini ~ # diskutil mount disk1s5    

Volume macOS on disk1s5 mounted

root@notsures-Mini ~ # sudo mount -uw /Volumes/macOS1

mount: unknown special file or file system /Volumes/macOS1.

I have repartitioned destroying my partitions and reinstalled twice already and still cannot get it to work. I have tried it without creating the /Volume/macOS1 folder.

I've even changed my com.apple.boot.plist in /Library to:

    <key>Kernel Flags</key>
    <string>-no_compat_check cs_enforcement_disable=1 cs_debug=1 amfi_allow_any_signature=1 amfi_get_out_of_my_way=1</string>

I have tried sudo spctl --master-disable

I have tried sudo mount -uw /Volumes/macOS1 /dev/disk1s5

Nothing is ****ing working.

Any advice? Using build 20A5384c

 

[ghost82]

"Unfortunately" this is the expected behavior since you are booting from a snapshot and not from the disk.
You need to disable authenticated-root and sip from the recovery (must be "disabled" not "unknown"), then in recovery you need to tag an empty string snapshot to boot from the live disk and delete all the other snapshots (that was how worked in my case).
However, I don't recommend

More info here:

macOS 11 Big Sur on Unsupported Macs Thread

I wrote that you should do that from a Big Sur Recovery environment , though it is also doable from normal booting, but with few changes, first requirement is csrutil authenticated-root disable, then from your picture, copy paste one line at once: sudo -s csrutil authenticated-root (check...

forums.macrumors.com

and here:

macOS 11 Big Sur on Unsupported Macs Thread

That method to fix "sudo mount -uw /" doesn't delete the snapshot but tags an empty one, you could reuse a previous snapshot from an USB BigSur installer recovery: diskutil apfs listSnapshots /Volumes/BigSurLabel mount -uw /Volumes/BigSurLabel cd /S*/L*/File*/apfs*/C*/R*/...

forums.macrumors.com

In the above post jackluke doesn't delete the snapshots, this didn't work in my case (had to delete the snapshots).
Take also into account that without booting from a snapshot you will not able to update the os through system preference pane (at least this happened from beta 8 to beta 9)