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User profile for user: Merced_x
Merced_x Author
User level: Level 1
8 points

no disk to install os

So I have done digging through google and numerous other sites.


this is a 13” 2015 MacBook Pro model A1502. The original SSD would not show when trying to reinstall from safe mode “cmd, option, r” so I thought the ssd failed and bought a new one. The connector is soldered straight to the motherboard so there’s no cable that could be faulty. At least that’s what it looks like. I replaced the old ssd with a new one and still no disk showing when trying to install. I have also tried the option to select “show all drives” but it is greyed out and cannot be selected. The OS that is trying to install is Mavericks. At this point I’m not sure what else I can do and not finding any more information on the web. Any help would be greatly appreciated. I have attached photos.

Thank you


edit: this is the new ssd 

DATARAM 512GB M.2 M-Key PCIe NVMe SSD​



MacBook Pro

Posted on Apr 9, 2021 9:27 PM

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User profile for user: HWTech
HWTech
User level: Level 9
61,766 points

Apr 11, 2021 8:27 PM in response to Merced_x

If your laptop already had macOS 10.13+ installed before your original Apple SSD failed, then you just need to boot from a macOS 10.13+ installer either from a bootable macOS USB installer or from Internet Recovery Mode (Command + Option + R). Unfortunately Internet Recovery Mode won't always boot the most recent macOS installer using that key combination.


If macOS 10.13+ was never installed on this laptop prior to the Apple SSD failing, then unfortunately you need to have an Apple original PCIe SSD installed internally in this laptop because the system firmware updater requires this exact hardware configuration. In addition you need the proper Apple PCIe SSD for this exact model laptop since macOS knows which SSD belongs in some laptops. I have personally seen macOS refuse to boot or install when the wrong Apple PCIe SSD is installed in a Retina laptop even though a non-Apple OS will work perfectly fine. Apple has made a real mess of these Retina laptops and macOS.


You must actually install macOS 10.13+ and not just boot macOS externally in order to install the system firmware update. Even if you want to install macOS 10.13+ to an external drive you must first have an original Apple PCIe SSD installed internally and the internal Apple PCIe SSD must be properly partitioned & formatted.


Without the system firmware update from macOS 10.13+, then booting from an external macOS 10.13+ USB drive won't see the NVMe SSD.




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User profile for user: HWTech
HWTech
User level: Level 9
61,766 points

Apr 10, 2021 10:33 PM in response to Merced_x

In order to use an NVMe SSD requires using macOS 10.13+.


Using an NVMe SSD also requires that the laptop's system firmware was first updated to support an NVMe SSD before installing the NVMe SSD which means that you had to have had macOS 10.13+ already installed on this laptop before replacing the original Apple SSD.



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no disk to install os

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