Internal SSD only recognized when booting externally.
i have a weird problem with a MBPr 15" Mid 2012. Lets call it MBPrA.
MBPrA has a broken SSD but boots normally from an external drive.
I removed the SSD from a non working model from the same year (MBPrB) and put it in MBPrA.
MBPrA doesn't boot and i get the ?-Folder sign.
When i boot MBPrA from external again the new internal SSD is recognised normally and i can browse files on it. The SSD definitely has a system on it.
I'm really really confused...
I also need to mention that the SSD is APFS formatted on High Sierra. MBPrA hasn't been upgraded in a while and might last have run on 10.11. Is it possible it didn't get a firmware upgrade that is needed for APFS?
Thanks in advance!
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