Then clone the updated original Apple SSD to the new internal SSD drive. Which means, every OS update, you need to take the computer apart and re-insert your original SSD, update the boot rom and security patches and then take the original SSD out, and re-insert your new SSD. Apple checks this and if it detects you are not using an Apple internal SSD drive, it will not upgrade the boot rom. The only downside to this setup is that, moving forward non-Apple SSD drives will NOT ALLOW further boot rom updating. You can save some headache doing this manually by just buying a pre-made and pre-ready NVMe bladethat already has the converter attached for a little bit more than DIY. If you do want to upgrade to M.2 NVMe version, your boot rom needs to be 117.0.0.0.0 in which you have and you need a partition formatted via High Sierra latest build and is bootable. You can not stick in a normal 2.5" Samsung version. You can only change the internal SSD to the Samsung 970 EVO blade M.2 NVMe version using a special adapter to convert Apple's blade interface to M.2 NVMe form factor. When you upgrade to Mojave or Catalina, you may receive the newer version of the boot rom. If you have High Sierra now, that means your SSD is APFS formatted and is bootable. Your SSD will disappear once the OS install is complete. Any rom that has the alphabet characters are older and will not allow APFS booting. Your bootrom is current as the newer rom only are listed as numbers with no alphabet characters.
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