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.