Enter your system lock pin code to unlock this mac)

You have set a password for it. If you cannot recreate it. You can call Apple. They charge $20 on most calls. Might give you a freeby on this problem. You will need the serial number on back of machine which I had to use a magnifying glass to read. Good luck

Hello:
1) What model and what year is your Macbook Pro?

2) What country are you in?

3) Is your Macbook still under warranty? That is, can you call Apple or send it to Apple for repair if you have to? Because on some Macbook Pros, only Apple can reset the EFI PIN

https://iforgot.apple.com/password/verify/appleid

The Mac is locked and has it say you need a code to open, so if you know the person who gift you the Mac ask for the code if no the only remedy is to re-load the system but you will need the the copy of the O.S.

Problem: Your Mac got locked via iCloud and on boot displays "Enter your system lock PIN code to unlock this Mac." It also sets an unknown password on the firmware so you can't boot from a disc. And you don't know the PIN code for a variety of reasons (not my business).


Solution: Mount the locked drive on another machine, find the PIN, re-install the locked drive into the original Mac, enter the PIN, resume your business.

Tutorial:
*I'm going to post the steps I did in my case and suggest steps you might take if your case varies.

Things Needed:
1. Alternate machine with space to mount an additional drive. (works on Mac or PC*)
*If you're using a PC, you'll need to download and install Mac Drive to be able to read the contents from a Windows environment.
2. You might need a SATA to USB adapter if you have a laptop without room for an additional drive.
3. Screw driver to disassemble the Mac.

Step 1: Remove the locked hard drive from your Mac.
You can find detailed guides for your specific machine at http://www.ifixit.com/Device/Mac

Step 2: Install the drive into your alternate machine. But make sure you do *not* boot from it. Boot from your regular drive.
If you do not have an alternate machine, feel free to ask a tech buddy of yours to lend you their machine.

Step 3: Once booted into the alternate system, locate your locked drive.
In my case it was drive D: on Windows. Now browse to \Users\username\Library\Application Support\iCloud


Step 4: In the folder "iCloud" find a file named with a bunch of numbers: ##########.lock In my case it was: 1138515150.lock


Step 5: I'd suggest that you take a picture of this file name for accurate reference. But you can also just write it down.

Step 6: Once you got the number, power down the machine and remove the locked drive.

Step 7: Install the locked drive back into the original locked Mac.
Follow your iFixit guide from Step 1 in reverse to put the drive back.
*It is important that you put it back in the machine where it was originally locked* so that the motherboard firmware will be unlocked in the next step.

Step 8: Boot up the locked Mac and referencing the number you recorded, you can start trying 4 numbers at a time for the PIN.
Try the first 4, then the second 4, and so on..
For example: 1138, 1385, 3851, 8515, 5151, 1515, 5150.
In my case the PIN was the second to last 4 digits: 1515
If you typed in more than 10 combinations, then it says that you are locked out for a minute. Just restart the machine and continue entering the combinations from where you left off.

Once you enter the right PIN, the Mac will instantly reboot proceeding to where you were at when the lockout occurred. It will also remove the firmware password.

Maybe the owner's manual might make reference to some sort of reset option. If the password is a simple 4 digit code, then guess it. Most peoples' passwords have something to do with the person who set the password, I.e. a nickname, name of a family pet, anniversary date, etc.

Someone has done a remote lock on your laptop. Probably the previous owner, a family member, or someone with access to your laptop and Applie ID account info. Ask them for the PIN code (the person in the know), call Apple and talk to the genius bar, or get your money back.

The other and more sad reason that this happened is because the laptop was stolen and the person that it was stolen from has locked it. BTW, Macbook Airs also have GPS inside so the owner can trace where it is and since they remotely locked it I would assume that they are looking for it. Hopefully this is not your case, but if it is....

You can reset your password with the OS disc. Reboot using the disc and choose Reset Password from the menu bar.

If u enter PIN code incorrectly 3 times, PIN will be blocked n phone will ask you for PUK(Personal Unblocking Key). This is a 8 digit code. If u enter Incorrect PUK for 10 times Your SIM will be lock permanently.

Your cell phone service provider can(Call from other no. n ask tell them for puk of ur no.) give you the PUK code aft3r answering simple security question.
Later enter PUK than enter new PIN, confirm new pin. Go to -Setting
-Security
-SIM lock
-off
Disable SIM n Later Phone Lock
PS:(You have to block your PIN to get access to PUK,
Default PIN- 0000, 12345)

You need to get a PUK code from your service provider. Since it's the sim card that locks not the phone they are the only ones who can provide it. Enter the wrong pin code 3 tiimes and the phone will lock. Then enter the PUK code and this will unlock it. You'll then be asked to enter a new pin code which will become your new pin number.