Thanks for reaching out to the Roku community!
Please follow these steps on how to update or create a Roku PIN CODE.
How do I access my PIN preferences?
How do I set a purchase PIN?
Once you access your PIN preferences, follow the steps below to set a purchase PIN.
For full information on this, you can take a look at this link: How do I create or update the PIN for my Roku® account? | Official Roku Support
Hope this helps! Let us know if you have any other concerns.
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Need to set up a pin