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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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New Transcend SSD Not Recognised by MacBook

I was given an old MacBook Pro (early 2015, 13”, retina) with a corrupted hard drive which I was unable to revive. I bought the Transcend Jetdrive 850 SSD to replace it. Using a friend's MacBook, I downloaded the Mojave installer into a USB key. However, when I launch the MacBook into recovery mode (Option + R), it won't recognise the new SSD, either in Disk Utility or when using diskutil list in the Terminal.

It still recognises the old corrupted SSD so it's not the connector that is broken, and I've been given a replacement Transcend drive that still isn't recognised, so it's unlikely that both new SSD's have shipped faulty. Unfortunately I don't have immediate access to another Mac, and don't have an enclosure for an NVMe SSD. If need be I can get access to a Mac, and am willing to buy an enclosure if it is likely to be the solution.

Would connecting the SSD externally to another Mac using an enclosure (and then formatting it if recognised) be a likely solution?

Could another reason be that I don't know what OS was running on the Macbook before the original SSD got corrupted, and it needs new drivers to detect the new SSD? If so, what would be a way to work around that?

Thanks!

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Well you’re warm ;-}

Your systems firmware (EFI) was not updated to support the newer APFS file system and the installer / recovery files have an expired certificate If you've got an old macOS install image, it will probably stop working today

You’ll need to jump back to MacOS Sierra and you’ll need to get this OS image in Step 4 here: How to upgrade to macOS Sierra

Using another Mac follow this guide to create an OS installer USB thumb drive How to create a bootable macOS Sierra installer drive

Once you’ve got the drive formatted and setup under GUID / HFS+ you can then upgrade to Mojave with GUID / APFS file system. You’ll need this image file though How to upgrade to macOS Mojave again the file link is in Step 4.

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Thank you very much for the advice, it's definitely got me a lot closer! However, I'm still having a few issues and am now at a loss...

I made a bootable Sierra installer on a USB , and installed Sierra into a larger USB stick, which I can now boot from. I couldn't originally see the SSD in the Disk Utility when running from the USB stick, but downloaded the Sierra update. Then I could see and format the SSD from the Terminal and Disk Utility when running Sierra on the USB stick.

However, I've tried two main things since then which I cannot get to work:

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1)I tried updating Sierra to High Sierra on the USB stick to try and force the EFI update. That works until the Mac reboots a couple of times during the update, and it then gives an error saying "error when checking firmware, restart and try again". I tried repairing the volume but it didn't work.

2) I tried directly installing Sierra onto the SSD. I first tried this in recovery mode, using a bootable installer USB. However, the Mac doesn't recognise the SSD in Recovery mode, it only appears to recognise it when running Sierra off the USB stick. So I tried installing Sierra onto the SSD using the Sierra installer, from the USB stick. However, this appears to work until it needs to restart to install the updates. When it restarts it just boots Sierra off the USB stick. If I try removing the USB stick, it doesn't recognise the SSD.

I'm going nuts trying to figure things out, so if you have any ideas I'd be very, very grateful!

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@jasperthedog - I would speak with Transcend support to see what they say. I'm thinking you have a SSD firmware issue here.

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Did you manage to figure this out? - I think I'm struggling with the same issue.

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