To understand the digest, one must first understand "VBMeta." Short for , VBMeta is the cornerstone of Android’s Verified Boot process (AVB).
fastboot flash boot custom-boot.img
Mira wrote small tools to recompute vbmeta digests and verify each partition’s signatures. She built a graceful recovery flow: a diagnostic screen that explained to users, in plain language, that the device had detected a signature mismatch and offered safe steps to recover: reflash from trusted media, retrieve backups, or visit support. For devices whose storage had degraded, she created a fallback that allowed limited safe mode access so data could be salvaged. ro.boot.vbmeta.digest