Submitting samples with the Auditor app (attestation.app/about) helps with more than expanding device support for it. The samples act as a device survey and are used to find potential targets for GrapheneOS. It acts as a useful filter for whether devices meet some requirements.
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To help with this, install the app from either Play (play.google.com/store/apps/det) or GitHub (github.com/GrapheneOS/Aud) and use 'Submit sample data' in the menu. It needs to be a device launched with Android 8+ for attestation support and running the stock OS with bootloader locked.
