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Upgrade from mountain lion to mojave went wrong

S

Silver78

Cancelled
Original poster
Aug 24, 2013
524
280
i did a complete reset of my mac and after it worked. Then i went and downloaded mojave and follow install instructions.
Now the mac write system could not be installed and only option is to press restart.
After restart it wants me to select system to start up on mac but show no options for system?!
Anyone know what i should do now?
 

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Silver78 said:
i did a complete reset of my mac and after it worked. Then i went and downloaded mojave and follow install instructions.
Now the mac write system could not be installed and only option is to press restart.
After restart it wants me to select system to start up on mac but show no options for system?!
Anyone know what i should do now?
Click to expand...
You MUST install High Sierra before going into Mojave so that your Mac upgrades its rom to support APFS which is mandatory to install Mojave. That’s why your computer can’t see any disk to install into
 
LuisN said:
You MUST install High Sierra before going into Mojave
Click to expand...
That is not the case.
[doublepost=1562523964][/doublepost]
Silver78 said:
i did a complete reset of my mac and after it worked. Then i went and downloaded mojave and follow install instructions.
Now the mac write system could not be installed and only option is to press restart.
After restart it wants me to select system to start up on mac but show no options for system?!
Anyone know what i should do now?
Click to expand...
What model computer do you have?
 
LuisN said:
It is, he has a MBP 2012 AFAIK, so he can't go directly from anything prior to high Sierra to Mojave because it won't apply the required EFI update. I may be mistaken though...
Click to expand...
You're indeed mistaken. The required firmware update is applied as part of the Mojave installation process. The only exception to this is the 2010/2012 Mac Pro, which does require High Sierra to be installed first.
 
Mine is a mid 2012 (non retina) and I was running on high sierra. I just installed Mojave and it's working great. Call Apple if you haven't already and ask them if you can go from mountain lion directly to Mojave. I was starting to have issues on HS. That's when I decided that my last ditch effort was to upgrade and it seemed to have fixed everything. I did call apple to make sure that it was ok (even tho I read it was) to go to Mojave on this "older" laptop without retina. And they said, YES - do it. And it worked out perfectly so far.
 
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