Fortunately, I have not upgraded my 6+ to anything above 9.3.3. What I would like to do is downgrade my jailbroken 9.3.3 to 9.0, which is a firmware that I can jailbreak without worrying about certificates expiring or rebooting back to stock. Has anyone used Prometheus to do this downgrade? Was it successful? What is required in terms of shsh blobs?