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Hmmm... that should work. Let's backup. Could you perhaps have an underlying disk problem? What lead you to do all this to begin with?

Those models also are known to have disk cable issues that have symptoms like drive failure.
 
Could you perhaps have an underlying disk problem?
I don't think so. My friend bought the MBP 1.5 years ago and changed to new SSD (I just got it from my friend, he rarely used it, almost never used it).

What lead you to do all this to begin with?
It happened after I installed serial console driver (I want connected it to Firewall) and reboot the MBP.

Are there other ways that I need to try?
 
Do you have an external USB enclosure you could put the drive in, then boot to the USB key and see if you can see and format the drive that way.
 
Hi Weaselboy,

I've swapped my disk to another MB and erase disk was works. The installation was successful also.

How to download Sierra installer because I can't download from OS X El Capitan.
 
Hi Weaselboy,

I've swapped my disk to another MB and erase disk was works. The installation was successful also.

How to download Sierra installer because I can't download from OS X El Capitan.
What comes up if you run software update?
 
It said "the version cannot be installed".

Screen Shot 2019-04-18 at 1.44.52 AM.png
 
I'm not quite sure how you got in this mess, but here is how to fix it. (I am assuming here there is not some underlying hardware issue that got all this started).

Hold command-option-r at boot and select your wifi when asked. Then you will see a spinning globe while the recovery utility downloads and installs. Once that is done you will see the recovery screen. From there launch Terminal from the Utilities menu and enter the line below exactly like I have it, including the quotes. That will blow off the Fusion drive.

Code:
diskutil cs delete "Fusion Drive"

Now quit Terminal and launch Disk Utility. You should see a screen like this offering to fix the Fusion drive. Go ahead and click Fix to rebuild the Fusion drive.

View attachment 610983

Now quit Disk Utility and click reinstall OS X at the top and wait for it to finish and restart. This will put you on the OS X version that came from the factory. You can update to El Capitan after if you like.

What you are seeing locked there in your second screenshot is the Recovery HD partition, and that is as it should be and not the problem. The problem is you borked the Fusion drive somehow and this will fix it.

Hello my mac blinks a folder with a quetion mark until I figured out how to get it to macOS utilities and I did the first aid test and evry thing but when I try to install MacOS high Sierra it says the disk is locked when I click on Macintosh HD can u please help me thanks in advance.
 

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I'm not sure it's pretty brand new I bough it this year 6 months ago brandnew
iMac or MacBook? Did this just happen in its owm, or were you trying to do something that lead to this issue?

You be able to command-option-r boot to Internet recovery and from there erase the drive then reinstall the OS. Can you get to Internet recovery? You should see a spinning grey globe as the recovery utility downloads.
 
iMac or MacBook? Did this just happen in its owm, or were you trying to do something that lead to this issue?

You be able to command-option-r boot to Internet recovery and from there erase the drive then reinstall the OS. Can you get to Internet recovery? You should see a spinning grey globe as the recovery utility downloads.
It's an iMac I was trying to factory reset the computer and it happend. I an able to get to mac OS utilities but I cant erase the drive or reinstall the os
 
Do you know if you have a Fusion drive model?

command-option-r boot to recovery then when the recovery screen comes up go to the Utilities menu and open Terminal. Then enter each of the following two commands and tell me the output of each.

Code:
diskutil list

diskutil cs list
 
Do you know if you have a Fusion drive model?

command-option-r boot to recovery then when the recovery screen comes up go to the Utilities menu and open Terminal. Then enter each of the following two commands and tell me the output of each.

Code:
diskutil list

diskutil cs list
This is what it says
 

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do you erase what is already written in Terminal Utilities and then write the line you shared, or do you type it in after what’s already there?


I'm not quite sure how you got in this mess, but here is how to fix it. (I am assuming here there is not some underlying hardware issue that got all this started).

Hold command-option-r at boot and select your wifi when asked. Then you will see a spinning globe while the recovery utility downloads and installs. Once that is done you will see the recovery screen. From there launch Terminal from the Utilities menu and enter the line below exactly like I have it, including the quotes. That will blow off the Fusion drive.

Code:
diskutil cs delete "Fusion Drive"

Now quit Terminal and launch Disk Utility. You should see a screen like this offering to fix the Fusion drive. Go ahead and click Fix to rebuild the Fusion drive.

View attachment 610983

Now quit Disk Utility and click reinstall OS X at the top and wait for it to finish and restart. This will put you on the OS X version that came from the factory. You can update to El Capitan after if you like.

What you are seeing locked there in your second screenshot is the Recovery HD partition, and that is as it should be and not the problem. The problem is you borked the Fusion drive somehow and this will fix it.
 
do you erase what is already written in Terminal Utilities and then write the line you shared, or do you type it in after what’s already there?
You would want to enter that as a new command in Terminal with nothing else on the command line.
 
Hi guys,

I'm having an issue that needs some expertise ( Weaselboy !?! ) or anyone at all.

My MacBook 12" 2016 died from one day to the other.
here is what I did.
Charged the computer. Try to boot up but at half way it just switches off.
Went to internet recovery, choose wifi, boot it up and got an error saying -2003f. picture attached
Started again and run first aid on recovery mode, You can see from screenshot the result.
Went to erase disk, you can see the result.
Tried to unmount the disk and erase portion didn't work.
Did USB boot up - tried first aid - tried erase same errors.
Tried installing new system but it shows device is locked.
There is no firmware password set up.
Tried going to show all devices at the disk utility and try to erase there with APFS or Mac journaled or do new partion etc. Nothing at alll works.

I ran command + D diagnostic, it says no issues.

img-3715.p8h1q
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whatsapp-image-2019-04-28-184844.p8xNH
img-3716.p8Yqf
img-3714.p8Udd

please tell me what did I miss...?! because it really start to
 

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You cannot erase because it looks like you are still booted to the drive in Recovery. You need to get to Internet recovery then erase the drive. That 2003f error is usually when you are trying to use Internet recovery with a wifi encryption type not supported. Can you open up the wifi (no password) just to get this done?
 
You cannot erase because it looks like you are still booted to the drive in Recovery. You need to get to Internet recovery then erase the drive. That 2003f error is usually when you are trying to use Internet recovery with a wifi encryption type not supported. Can you open up the wifi (no password) just to get this done?

I did boot up on internet recovery: Same same. Attached all pictures for reference.
there was no error of 2003f.

what's next?
 

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I figured if I make a 128gb USB APFS I can install Mojave on it, Now that's done. System up and running.
Trying to delete the SSD, format, partion, first aid, nothing works.

Any suggestion?
 
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