I just bought an early 2015 MacBook Pro that comes with macOS sierra. I want to update it to Mojave so i could run newer version of Xcode. But unfortunately i got this error everytime i tried to update it:
An error occured while verifying firmware.
I tried to update it to High Sierra, but it does the same thing.
I borrowed my friend's bootable USB with High Sierra and change my SSD format to APFS, but it still gave me that error. I've tried to google for an answer and one of the forums that discussing this issue tells the original poster that it might have a problem regarding the logic board of the MBP. Which kinda freaked me out.
Why is this happening? And what should i do? Because i just switched to a mac from a windows laptop, so i still have zero knowledge about macos.