Chosen Solution
Hi! I have 2 similar A1708 macbooks, one without any SSD and the other with the genuine apple 512gb ssd. Yesterday i tried swapping the ssd from the one that was working properly (due to lcd fault anymore) and putting it into the other one. The surprise was that couldn’t recognize it at all. I tried in recovery mode and also looking it up in utility or terminal but same issue. Then, i just placed it back on its initial macbook and it showed up the same issue. I did reseted the NVRAM as per apple’s instructions but still, no luck. Any ideas what could be done? (Idon’t think the ssd died just from beeing removed)
The version of macOS the given system has a bearing here. One of your systems might still be running macOS 10.12.5 (Sierra) which was the last version of macOS which used HFS+ and your other system is using MacOS 10.13 or newer which uses AFS. So the given systems firmware doesn’t have the needed update to boot up under AFS. To overcome this you’ll need to re-install your OS to allow the installer to update the systems firmware. You can do this using Internet Recovery or using a bootable OS installer drive setup from another Mac with the OS version you want to use (I recommend you upgrade to Mojave 10.14.x as its better than High Sierra 10.13.x)
