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I have a regular Mid 2015 Macbook Pro. The only non-Apple thing in it is the SSD. And this problem is widely mentioned on the internet. I was just putting it on a different site to see if someone here has any ideas. The Installer is fine... As long as you have the original Apple SSD. But, for...

I'm sure I can go to a shop that services Macs and (pay money to) get an HD to get go through the process with, but... Apple really needs to release just the firmware update (or fix the installer)

It appears that if you replaced your existing Apple SSD with a new one from another manufacturer, the firmware update can fail. Which results in the whole install / update failing. Creating a USB installer doesn't solve the problem. Some people have installed their original SSD, finished the...