Updating old personas within an existing product

What kind of a way do you choose to update the old personas of an existing product?

1. Interview and gather qualitative data from a wide range of random users of the product and then create personas between them.
2. Consider old persona feature patterns and interview with these target group only (A feature pattern example; newly graduated personas, experienced personas etc.)

By the way, the reason for updating the old personas is that old ones have a lot of missing information and also have old fashion persona template.