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CC2640R2F: How can I change the value of characteristic?

Part Number: CC2640R2F

I am a student studying simple_peripheral code.
I wanted to change the characteristic of a given custom service, so I tried changing the values of static uint8 simpleProfileChar1 and static uint8 simpleProfileChar2 of simple_gatt_profile.c.
But nothing changed.
How do I change the value?