![]() Also, read as Mac will automatically update the firmware and format as APFS while moving to High Sierra. I read in other forums that this might be due to APFS formatting of the disk but I dont get that option while formatting via Disk Utility as I use Sierra. When I see that many people dont have troubles installing the latest OS (Catalina) in the Mid 2012 Version (Non Retina model), why am I having troubles in installing. I tried directly installing from App store, tried via Bootable USB but for all the cases I get the same error. So the issue is when I try to install Mac OS High Sierra or above (till Catalina), it takes 15-20 mins and then I see an error as 'An error occurred while trying to verify firmware' and not allowing me to pass the OS installation. Some spec about my mac (A1278) before I proceed to the issue:Ĥ80 GB Crucial BX SSD (it is currently in Optical Bay, since my HDD flex cable is not working and the original HDD slot is empty). ![]() ![]() I use a Macbook pro mid 2012 13" which is running Sierra 10.12.6 currently. ![]()
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