You can keep your old factory SSD in the enclosure that comes with the Transcend SSD kits for external storage, or use the OWC Envoy Pro enclosure (see the Accessories section of this page on the left).

Otherwise, you can use Time Machine to backup your old SSD to external storage, then restore after installing the new SSD.

You can enter recovery mode - (reboot then hold down 'Command key + R') and use disk utility to 'restore' from your old SSD to the new one, or use the Super Duper app to perform the clone, then switch the drives.

If you are running a version of MacOS before High Sierra (10.12.6 or earlier), and don't plan to upgrade, then stick with the Jetdrive 820 and 825 products.

*Note, the Transcend Jetdrive 850 and 855 products are NVMe based, therefore require MacOS High Sierra or above to be running before you attempt to install the SSD.

The Transcend Jetdrive 825/855 SSD upgrade kits allow you to clone your existing OS/app setup by first installing the new SSD in an external enclosure and attach to your system via the USB port.

Follow this guide to clone your old SSD and install the new one. To replace the existing SSD with a larger capacity version, see the product options from Transcend and OWC on the left.

By default, this model is configured with a custom PCIe 256GB 'blade' SSD connected via a PCIe port.

For better performance, consider upgrading the onboard SSD.

Sadly, it's not possible to upgrade the RAM in this model after it has been purchased.

If it is not recognized then you will need to put your old ssd back and install either High Sierra or Mojave once, to update your macbooks firmware. Special Notes: This SSD is pre-installed with OS Mojave.

Mid 2014 macbook pro 13 high sierra