Mac Pro 12.1 restarted with factory defaults but not possible to log in Apple ID
I want to give new life to my old Mac Pro v. 12,1 (i7, 16GB).
I have cleaned it to factory settings and reinstalled the system.
The updates of the system go only up to 10.10.5.
With that system I cannot even log in to my apple account since it requires adding a code from another device and the old system does not ask for a code.
What can I do to use this computer? It has still very good hardware. Please help.
MacBook Pro 13″, OS X 10.10