M.2 PCIe SSD to Compatible with 2013-2015 MacBook Air/Pro 28pin SSD Converter Adapter - Not Supports SATA SSD

Make sure the adapter is properly seated/inserted and it will work fine. You should be able to replace the original screw to lock your SSD card in place with this adapter attached to the SSD card. If you cannot insert the original screw, then you need to push the adapter in a little bit more.I used this with a 512GB Toshiba M.2 SSD drive which is now my boot drive. The new SSD runs a little hot so I also added a thin heat sink.

This worked great in an early 2015 Macbook Pro Retina A1502 with a 960 EVO. My understanding is you have to be on macOS High Sierra for these non Apple NVMe drives to work. I’m on High Sierra 10.13.2. My work bought this along with a Samsung 960 Evo NVMe M.2 SSD to upgrade the capacity in my Macbook Pro.The only problem I had at first was that I didn't have this little adapter shoved in all the way. If you think it is in all the way, it's not, shove harder than you think you need to... once it is in far enough you will be able to use the same original screw and screw hole to hold the SSD as the stock SSD. First, install Carbon Copy Cloner (trial version is fine) and then clone a backup to an external USB drive of some sort. After that is done shutdown your computer. Take all 10 screws out of the bottom cover and grab the back cover near the screen where the vents are and pull up. Now take the screw out of the stock SSD... gently lift and pull out. Put your new SSD into the adapter and then carefully and forcefully push the adapter with SSD all the way in to the slot. Replace the original screw. At this point I would advise resetting the NVRAM by pushing power then quickly holding down Option+Command+R+P until you hear the startup sound twice. I was getting kernel panic crashes until I did this. At this point you will want to boot off of the USB clone you made so power off the machine and hold down Option and push power and then select your USB clone you made and it will boot into it. If your drive is recognized you will probably get a message that a disk you inserted is not recognized... click Initialize. Open Disk Utility and select your new SSD on the left and click Erase and select APFS or Mac OS Extended (Journaled). Close Disk Utility and open Carbon Copy and select your source which is the USB Clone you booted off of and the Destination which is your new SSD and click clone.Once that is done you should be able to boot off of your new SSD, but you will probably want to clear your NVRAM again. I did a disk speed test of the stock SSD and the new 960 EVO and the write speed is about 300 MB/s faster but the read speeds are approximately the same. It also feels snappier but it could be the placebo effect.