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I have a Mid 2012 MacBook Pro with 512 GB hard drive which dual boots along with macOS Sierra.

I have converted macOS Mojave partition to APFS from Mac OS Extended (Journaled).

When attempting to install macOS Mojave 10.14.4 update, this screen stays for a while and then system restarts to back to macOS Sierra:

enter image description here

What is going wrong and how do I resolve the issue?

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Your 512GB HD is a SSD drive right? APFS works only on SSD drives. (except for the Fusion drives)

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