#Os mac sierra for 2012 macbook pro install
#Os mac sierra for 2012 macbook pro upgrade
#Os mac sierra for 2012 macbook pro password

Choose the 12+GB drive in the boot manager, once booted you can use Disk Utility to fix issues or reinstall the OSР”Вownload Links and matching Terminal CommandsР”В¬opy and paste this command into terminal and hit return:.

Finally plug your newly created bootable installer drive into your mac, hold the option key, while powering it on.

The Sierra and El Capitan commands show the proper format of this argument. Note: If your Mac is using macOS Sierra or earlier, include the -applicationpath argument.

#Os mac sierra for 2012 macbook pro install

Once downloaded use the terminal command below the install link to create a bootable installer.

Then download the OS you want from below.

First re-name your 12+GB drive РІР‚Сљ MyVolumeРІР‚Сњ With no quotes.

If still no luck but you have access to another mac and an erasable drive with at least 12+GB and formatted for OSX Extended, then follow these instructions:

#Os mac sierra for 2012 macbook pro password

(a firmware password can block this and some older backups might not have a bootable recovery partition)Р”В¬.

Hold the Option (alt) key during boot up and see if you can choose your Time Machine recovery disk If that doesnРІР‚в„ўt work, then can you boot from your Time Machine backup drive?

Verify the date and time are current, then close terminal and try to reinstall the OS from the main menu.Р”В«.

Then type or copy and paste this and hit the return key:.

Open Terminal from the pull down menu then copy and paste this command and hit return:.

MacOS Recovery needs the time/date to be updated to connect to the app store and download the OS If a wireless network is available, you can choose it from the Wi-Fi menu in the menu bar. What to do when РІР‚Вthe installer payload failed signature checkРІР‚в„ў or РІР‚Вthis copy of the install OS X application cannot be verifiedРІР‚в„ў:Р”Р„ll you need is a connection to the Internet. Install the macOS that came with your Mac, or the closest version still available.

#Os mac sierra for 2012 macbook pro upgrade

Upgrade to the latest macOS compatible with your Mac. Install the latest macOS that was installed on your Mac. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later. To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard.

After I did that and booted from Internet Recovery to the newest version of macOS, lo and behold, I finally got High Sierra instead of Lion, which worked. The answer I found was to replace the cable, which is something you can do if you have an older Macbook and is relatively cheap. That connection drop leads to this error message. Turns out, the cable connecting my Hard Drive was busted so that while it saw the drive well enough, and while Hardware Diagnostics says it's fine, and while Disk Utility said it's fine, it was NOT reliable enough to transfer the files. But even when I had the original Lion CD, I still ran into this issue. And then I ran into this issue.Р”Р‡or me, not even doing a local USB installer helped, namely because I didn't have a Mac that was 'old' enough to make an installer for this version of macOS. So I thought 'Hmm, oh that means Apple wants me to start with Lion, and then I can upgrade to something newer'. When trying to restore a 2012 Mac, I couldn't install any modern macOS version on it and Lion was the only one I could seemingly get from Recovery Mode.

I'm not saying this is your problem, but, this is a problem that impacted me recently so I wanted to share it in case it helps you figure out what's going on.