The following is the description of the manual：
Setting Data for Programming Option-Setting Memory :
(1) Changing the Option-Setting Memory by Self-Programming
(2) Debugging through an OCD or Programming by a Flash Memory Writer
The manual describes OFS registers as read-only, so how to set them?
The manual says that there are two methods for setting the above, is there a more detailed sample and step description,
Option bytes are flash memory locations.
Option bytes are programmed using the same methods as the code-flash.
Since you weren't able to reply to this post anymore, I've verified JimB's answer and I'm going to lock this thread now. Kindly create a new discussion if ever you have other questions or issues. All the best!
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