pls follow these steps to install MAC OS:
1. Make sure to move to High Sierra while still on your old drive, so that a newer firmware is installed that can handle NVME.
2. Do a full backup to your TimeMachine.
3. Create a High Sierra Installer on a bootable USB stick.
4. Open the macbook and disconnect the battery while switching out the drive and make sure both adapter and new SSD sit snug. Finally reconnect the battery before closing the shell.
5. Insert the Installer USB stick from step 2, and press the option key while the machine starts. Once it's up you can now go to the disk utils to format the new drive. After formatting the disk you can now restore from Time Machine.
For more details,you can contact us for install guider or go to our website to download it.
We accept payment by any of the following methods:
PayPal
Please pay as soon as possible after winning an auction, as that will allow us to post your item to you sooner!
Customer satisfaction is very important to us.
If you have any problem with your order, please contact us and we will do our best to make you satisfied.
If you have any queries, please contact us via ebay. We usually respond within 24 hours on weekdays.