There are many reasons for protecting your mobile applications against modification and tampering. Until recently you had to use third party tools or implemented your own app integrity checks and device rooting checks. Today you can use Android's SafetyNet Attestation infrastructure to ensure the integrity of your application and the user's device. Unfortunately, SafetyNet Attestation is not well documented by Google. This talk provides a deep dive into SafetyNet Attestation. We show what level of attestation SafetyNet provides and what it can't do. The talk is based on the lessons learned from implementing SafetyNet Attestation for an app with a large install base. We turned SafetyNet upside down to find its flaws and shortcomings. This talk will provide you with everything you need to know about Android's SafetyNet Attestation and will help you to implement and use it in your app.