Introduced with Android 8.0 (Oreo), vbmeta (Verified Boot Metadata) is a small but critical partition that holds cryptographic hashes and signing keys for other partitions like boot , system , vendor , and product . It is the cornerstone of 2.0.
| Term | Full Name | Purpose | What --disable-verification does | |------|-----------|---------|-------------------------------------| | | dm-verity (device-mapper verity) | Checks block-level integrity of read-only partitions (system, vendor) at runtime. | Does not disable verity by itself. Needs --disable-verity flag. | | Verification | Boot-time hash check | Checks the entire partition's hash against vbmeta before mounting. | Disables this boot-time hash check. Allows modified partitions to boot. | vbmeta disable-verification command
fastboot flash vbmeta your_backup_vbmeta.img (You can dump it if you have root, but if you’re here, you probably don’t yet.) Use the appropriate command for your device: Introduced with Android 8
fastboot flash vbmeta --disable-verification vbmeta.img | Does not disable verity by itself
fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img Now you know exactly what it does, how it works, and what it costs. Tread carefully. Disclaimer: Modifying your device voids warranties, may cause data loss, and can lead to permanent damage. The author assumes no responsibility for bricked devices.
| Method | How it works | Does it disable verification? | |--------|--------------|-------------------------------| | | Some Magisk versions try to keep dm-verity enabled while modifying boot only | No (partial) | | KernelSU | Kernel-level root that doesn't modify system partition | No | | AVB custom keys | Replace OEM keys with your own, sign all partitions | No (but requires re-signing) | | GSI with AVB test keys | Use pre-signed GSIs that match generic test keys | No (but risky) |