System lock pin code mac air - Apple MacBook Pro Notebook

I'm not clear what "30 pin" refers to. It sounds irrelevant to your question or am I missing something?

Try this:
Go to System Preferences, click on Sound. Make sure you are on the Output tab. Select your device.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_1e5d703456353ef9

EFI password can be undone within the boot disk utilities. The system lock cannot. Sounds like a stolen machine.

this will usually require wiping the disk

If you have forgotten, reset if iPad you might be lucky?

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

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.

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