How would a biological brain be updated with its digital memory?

In my story characters can go into perfectly simulated virtual worlds where their memories have been replicated down to the individual neurons and their protien structures. In these worlds time passes at a much slower rate meaning they can spend years enjoying fantasies, studying and training whilst only minutes or hours passes in the real world.

I am wondering how their digital conscious can downloaded back into their biological brain. Without them having robotic brains or even nanotech neuron replacements, is there an explanation how a fully biological brain can accept the digital data and allow it to change their own neurons?

I understand doing anything like this is so far into the future and our understanding of the brain isn't advanced enough yet so answers can only be theoretical but is there a plausable explanation for how this could happen?

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How would a biological brain be updated with its digital memory?

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