Hoping someone may be able to advise me on what to do next.
I have a 2011 13" MacBook Pro which I've mainly been using as a Linux machine but there was a version of macOS installed along side it.
I decided to upgrade to Sierra last night. Downloaded the installer, checked the md5sum everything checked out made a bootable USB drive and started her up everything seemed fine the USB booted and i figured I'd do a clean install and erased my entire HDD.
I ran the install and instantly got an error
OSX_FULL_MARKETING_NAME could not be installed
eventually though it went through with the install and at the very end I'm getting the error
The installer payload failed signature check
So far I've tried to
Reset my date and time
Re formatted my HDD
Reset the PRAM / SMC
Different USB port
But seems like either the USB is at fault or the installer is corrupted.
I've checked the error logs during the install and here's a few lines from it
No native mechanism to verify InstallInfo.plist
No native mechanism to verify InstallESD.dmg
pkgdmg is not signed or altered
pkgdmg validation has failed
Is there maybe a way to bypass the signature check someway?
This wouldn't really be the end of the world but now I can't even install macOS Lion from recovery turns out you need Mavericks – but without another Mac I can't see anyway of getting a copy of Mavericks on a USB (my cd drive doesn't work)
So I'm stumped as to what i can do here? Without going into an apple store do I have any options at all?
I would just install Linux and be done with it but from what I've seen its a good idea to have macOS along side it for firmware updates.
Apologies for the super long post but if anyone knows of any options I may have from here I'm all ears and would be very much appreciated.
Best Answer
Okay I've managed to find a fix if anyone is in the same boat here is one route you can take;
Find a download of OSX (Unfortunately if you don't have access to another Mac you only have one option. But as always be careful when downloading operating systems as you never know what someone could have added to them.. And of course upgrade ASAP)
If you're on a Windows machine you'll need three things;
First you'll want to insert the USB into your machine. Run command prompt and follow these instructions to make GPT partion on the USB.
Find your USB (example disk 1)
select disk x(example select disk 1)Then you want to run TransMac and in the left panel find your USB right click that and hit "Restore with disk image" select your dmg file and let it run.