It depends on which step you are stuck on, you need to keep track of the steps you are doing yourself. It's hard to tell so remotely when you don't know what the other person has already done, but I had to manually enter boot after completing the copy to the flash drive:
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What stage are you at now? Is the new Mac just on the flash drive, or is it already on the computer but not booting?
Helpful post? Buy me a coffee.

What stage are you at now? Is the new Mac just on the flash drive, or is it already on the computer but not booting?