11-05-2018 09:49 AM
HERO3 - Remove the battery and locate the white/silver sticker inside the battery bay. Your serial number will be 15-characters in length, and begin with "HD3."
If you are trying to update your camera, please reach out to our Support Team
You may contact them via phone or chat.
11-06-2018 10:09 AM
Please check misc and check them 1 by 1.
You should see it there.
If ever you can't see the serial number please take a screenshot and post it here.