08-08-2019 09:09 AM
Is this for the HERO5 Black or the HERO5 Session?
Are you referring to the side door?Please note that the side door is removable.
You may check the information/ video guide on How to Open Battery Door and Remove Side Door
If you need a new one, you may refer to https://gopro.com/en/us/shop/accessories/replacement-door/AAIOD-003.html
This should also be compatible with the HERO5 Black.