![]() However, this solution is time consuming. This way, we are guaranteed that the firmware will be updated as well. The reason, explained in full detail by Scott Helme, is that a widely used root security certificate, that for IdenTrust DST Root CA X3, will expire in just over a week, on 30. One solution we're looking at is to get a blank SSD, install El Capitan or until Sierra (whichever is available), and then upgrade to High Sierra. If you’re still running El Capitan, or any version of Mac OS X prior to 10.12.1, then you’re about to run into problems with some popular security certificates. When I looked up updates for our MacBook Pro model, the updates I found were dated way back 2010/2012, and I don't think these are the updates I'm looking for. However, this presents an inconvenience, it would be quite the hassle to reset the laptop and remember to hold down the alt/option key to be able to make the laptop boot properly. I was able to boot from our SSD and everything is working well. ![]() I then saw two options, an "EFI Boot" and our SSD. I reset the laptop and held down the alt/option key. However when we swapped in our SSD (High Sierra) and booted, it gave the blinking folder which means that it can't find an OS to boot from. It's working well with the current hard drive (El Capitan). ![]() Good day everyone, I have a 15" MacBook Pro Mid 2010. ![]()
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