There is no one definitive answer to this question. However, there are a few things you can do in order to revive a dead WhatsApp group. First, you can try to contact the group's administrators and ask for help. If the administrators are unavailable or unable to help, you can also try to revive the group by posting a message on the group's wall or in the group's chat logs. Finally, you can also try to revive the group by creating a new group and inviting the group's members back into it.