Use an external drive and reformat the blade GUID and try installing just Sierra. Apple has gone to a new format on SSD drives and I have found that it works very poorly on Legacy Machines, which your’s is now.
In case you are not aware, Apple won’t work on any machines (with a couple of excepts) over six years old. They expect you to trash it and go buy a new machine.
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'''Apple to Add 2012 MacBook Air to Vintage List with a New Twist'''
Use an external drive and reformat the blade GUID and try installing just Sierra. Apple has gone to a new format on SSD drives and I have found that it works very poorly on Legacy Machines, which your’s is now.
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In case you are not aware, Apple won’t work on any machines (with a couple of excepts) over six years old. They expect you to trash it and go buy a new machine.
Use an external drive and reformat the blade GUID and try installing just Sierra. Apple has gone to a new format on SSD drives and I have found that it works very poorly on Legacy Machines, which your’s is now.