unable to mount the MCA HD to backup the DATA

[lameron]

well. long story short, my friend try to update the MAC os (from mojave to Monterey)and get stuck, idk what he did but now his macbook pro 2015(a1502) is able to load into login screen but after login, it start the update bar and it stuck there, we wait it over night and its didnt move one bit,

so now the goal is the get into the macHD and backup all his data and then factory reset.
but i have try everything, and i cant get the macHD mounted and get the data out.
boot to recovery mode try to use terminal mount the HD, (fail)
try the "diskutil list // lvUUID" and i cant find the lvUUID
i install the osx yosemite into a usb thumb drive and boot the thumb drive, into yosemite and try to mount the macHD, (fail)
tried "sudo fsck_HFS /dev/disk0s2"(fail)
tried sudo mountDisk readOnly /dev/disk0s2" (fail)
i have try everything that i can find on the net and they all fail.
im run out of idea what can i do next.
any help!??

 

[Fishrrman]

Do you have a SECOND Mac available?
Have you tried connecting the MacBook to the second Mac using "target disk mode"? (if possible).

Another way:
Do you have a spare external USB hard drive around?
It can be an SSD, or even a platter-based hard drive.

If you do, you could try this:
1. Boot the problem Mac to INTERNET recovery (this is NOT THE SAME as "the recovery partition"):
Command-OPTION-R
at boot.

You'll need your wifi password.
The internet utilities take a while to load, be patient.

When the utilities load, connect the external drive.
Open disk utility.
Go to the view menu and choose "show all devices" (this step is VERY important!)
Now, look at the "list on the left".
Can you see the external USB drive?
If so, click on it and click erase.
Erase it to APFS, GUID partition format.
Then quit disk utility.

Now open the OS installer.
Begin clicking through.
When the installer asks WHERE you want to install (show all disks), "aim it" at the EXTERNAL USB drive.
The MacBook will reboot one or more times, and the screen will go dark for a few minutes at a time with no other evidence of activity. BE PATIENT.

If the install is successful, you should finally see the initial setup screen (choose your language).
Go ahead and create a basic account on the new external boot drive.

DON'T BOTHER with email, iCloud, or anything like that right now.
We just need a "good drive" that can boot the MacBook "to the finder".
Can you get it booted that way?

OK, if you can...
Can you now see the internal drive at all?
On the desktop, perhaps?
Even if it won't boot anymore?

Get back with this info.

 

[lameron]

thank you for replying
i do have the second macbook available, but i do not have the thunderbult cable to connect two macbook, im ordered and its coming this sunday,

as the second option that you mention, i have tried it already, install os yosemite into an EXTERNAL USB and boot from the EXTERNAL USB, i boot all the way up to the desktop but i still cant mount the disk0s2 from Disk Utility, nothing happen when i click mount button the disk0s2.
and i have tried to mount it from the terminal as well, it just wont mount. FML