Guide · SSD Upgrade

Why your NVMe SSD won’t boot on a 2013-2015 MacBook (and how to fix it)

Q: How do I update my MacBook's firmware?

The firmware updates automatically when you install macOS High Sierra or later on the original SSD. So you must not remove that drive before doing the update.

Q: Will any NVMe SSD do?

Not quite. You need an adapter because Apple's connector isn't the M.2 format, and ideally an NVMe model with a reputation for being stable on Mac. Some drives cause sleep or overheating issues.

You’ve fitted a fast, affordable NVMe drive into your MacBook Air or MacBook Pro Retina… and nothing: a frozen Apple logo, a prohibitory sign, or a drive that simply isn’t there. In almost every case, the hardware isn’t to blame: it’s all about the firmware. Here’s why, and the right order of steps to make it work.

Place du Mac— Technical guide— 21 July 2026— 7 min read

The essentials

An NVMe drive that won’t boot on a 2013-2015 MacBook is almost never a dead drive: it’s a firmware that’s too old. These Macs need two things: an adapter (Apple’s SSD connector isn’t the M.2 format), and above all a Boot ROM that knows how to speak NVMe — a capability added by an update shipped inside macOS High Sierra. And that update can only be applied while the original drive is still in place.

Two obstacles, not one

Why it fails: keep the two problems separate

Swapping the original SSD for a consumer NVMe runs into two distinct issues that are often confused. The first is visible, the second is invisible — and that second one catches everyone out.

Obstacle1

The connector isn’t standard

From 2013 onwards, Apple dropped SATA for a PCIe-format SSD… but with a proprietary connector (12+16 pins) that has nothing to do with the M.2 format of off-the-shelf NVMe drives. Hence the need for an adapter (such as a Sintech NGFF-to-Apple): it bridges the M.2 stick to the logic board, both mechanically and electrically. Without one, the stick won’t even fit.

Easy to solve: an adapter is all it takes — this is the lesser of the two obstacles.

Obstacle2

The logic board doesn’t “know” how to speak NVMe

This is the crux, and the part that’s almost always overlooked. The original SSD in these Macs works using a protocol called AHCI. Modern NVMe drives, on the other hand, use the NVMe protocol — newer, faster, but unknown to the original firmware. The Boot ROM (the first software layer, which runs before macOS even starts) acts as a gatekeeper: if it only knows AHCI, an NVMe drive is, as far as it’s concerned… invisible.

The real cause: a frozen Apple logo, a prohibitory sign or a missing drive = firmware that ignores NVMe.

The good news

Apple did add NVMe… but through an update

Apple did add NVMe boot support to these Macs — just not out of the box. That support arrived with the firmware shipped inside macOS High Sierra (10.13), and it has been present in every release since. In other words, the NVMe capability lies dormant in a firmware update: until your Mac has received it, it stays blind to NVMe, even if the drive and adapter are flawless.

A Mac that’s up to date (that has run High Sierra or later) has already received the NVMe firmware → the NVMe works.
A Mac left on an old version (Sierra, El Capitan…) has never received this firmware → the NVMe won’t boot.
The crucial point: the firmware only updates from the original SSD. If you remove the Apple drive before the update, you have no way left to flash the Boot ROM. This is the classic mistake.

The NVMe works

Mac with up-to-date firmware

High Sierra 10.13+ already run

Boot ROM that recognises NVMe
The drive appears in Disk Utility
Boots and installs macOS normally
All that’s left is to pick a Mac-compatible NVMe

The NVMe stays invisible

Mac left on old firmware

Sierra, El Capitan or earlier

Boot ROM that ignores NVMe
Frozen Apple logo, prohibitory sign
Drive missing from Disk Utility
Fix before removing the original drive

The right order of steps

5 steps to avoid hitting the wall

The golden rule fits in one sentence: you update the firmware BEFORE removing the original drive. Do it the other way round and you’re stuck.

STEP 1

Keep the original SSD

Leave the original Apple drive in place first; don’t remove it.

STEP 2

Install High Sierra+

Install macOS High Sierra or later: the firmware update is applied automatically.

STEP 3

Check

Make sure the Mac has restarted properly and the installation has run to completion.

STEP 4

Swap the drive

Shut down, then fit the NVMe on its adapter in place of the original SSD.

STEP 5

Reinstall macOS

Format the NVMe and reinstall macOS, for example via Internet Recovery.

Not to be overlooked

Three details that make the difference

Choosing the NVMe and the adapter. Not all NVMe drives behave the same on a Mac: certain models (particularly those without a cache, or a few specific series) cause trouble. Picking a model known to work well on Mac saves you the headaches.
Sleep (standby). On the 2013-2014 models, deep sleep could be a problem (the Mac wouldn’t wake). A firmware update, introduced from macOS Big Sur 11.0.1, fixed this behaviour: all the more reason to keep the firmware up to date.
The models concerned. MacBook Air 2013-2017, MacBook Pro Retina late 2013-2015, plus several iMac and Mac mini from the same period: all fitted with Apple’s proprietary PCIe SSD connector.

The myth to bust What many people believe — and it’s wrong

“My NVMe won’t boot: it must be faulty.”

Wrong, in the vast majority of cases. An NVMe that stays invisible on a 2013-2015 Mac is almost never a dead drive: it’s a firmware that’s too old and doesn’t yet know how to speak NVMe. The logic board first has to “learn” NVMe via the update shipped with High Sierra or later — and that update can only happen while the original drive is still in place. Follow the order, and the upgrade goes off without a hitch.

If there’s one thing to remember

Firmware first, drive second.

An NVMe that won’t boot is almost never the drive: it’s the logic board that hasn’t yet learnt NVMe. Install High Sierra (or later) on the original drive to flash the Boot ROM, then and only then swap the drive. Unsure whether a particular model is compatible? We’re happy to advise.

Take action

An SSD to fit in your Mac?

Browse our SSDs and drives tested for Mac, with a 2-year warranty. And once the drive is in place, follow our step-by-step guide to reinstall macOS.

See SSDs for Mac → Reinstall macOS over the Internet →

Frequently asked questions

NVMe on a 2013-2015 MacBook: your questions

Why doesn’t my NVMe show up in Disk Utility?

Because your Mac’s firmware (Boot ROM) doesn’t yet know the NVMe protocol. Until it has received the update shipped with macOS High Sierra or later, the drive stays invisible — even if the adapter is fine.

How do I update my MacBook’s firmware?

There’s no dedicated button: the firmware updates automatically when you install macOS High Sierra (or later) on the original SSD. That’s exactly why you must never remove that drive before doing the update.

I’ve already removed the original drive — what now?

Temporarily refit the original Apple SSD (or another drive the Mac recognises), install High Sierra on it to flash the firmware, then put your NVMe back in. Without a drive the Mac can boot from, there’s no way to apply the update.

Will any NVMe SSD do?

Not quite. You need an adapter (Apple’s connector isn’t the M.2 format) and, ideally, an NVMe model with a reputation for being stable on Mac. Some drives cause sleep or overheating issues: when in doubt, ask us for advice.

Which Macs are concerned?

MacBook Air 2013-2017, MacBook Pro Retina from late 2013 to 2015, plus several iMac and Mac mini from the same period: all use Apple’s proprietary PCIe SSD connector and therefore need an adapter and up-to-date firmware.

Place du Mac guide — on 2013-2015 MacBooks, installing an NVMe SSD requires both an adapter AND up-to-date firmware (Boot ROM), delivered by macOS High Sierra or later; this update must be done while the original drive is still in place. Exact compatibility depends on the model and the NVMe chosen. Apple, Mac, MacBook, MacBook Air and MacBook Pro are trademarks of Apple Inc.; Place du Mac is an independent repairer, not affiliated with Apple Inc.