Samsung uses . The vbmeta.img file contains cryptographic hashes for other partitions like system , vendor , and boot .
You are trying to flash an older vbmeta than the bootloader currently expects. Samsung’s "anti-rollback" prevents downgrading. Fix: You must flash the vbmeta extracted from the latest firmware version for your region (e.g., M315FXXU5GVL1). Re-download the newest stock ROM. vbmeta samsung m31
VBMeta (Verified Boot Metadata) is part of Android’s Verified Boot (AVB) system that ensures integrity of boot and system partitions by verifying cryptographic signatures at boot. On the Samsung Galaxy M31, which uses Samsung’s firmware and often a mix of Android versions and vendor customizations, VBMeta plays a key role in enforcing whether modified boot, recovery, or system images will boot. Bypassing or modifying VBMeta is commonly required for rooting, installing custom recoveries (e.g., TWRP), or flashing custom ROMs, but doing so affects device security and may trigger Knox/firmware flags and OTA update issues. Samsung uses
In simple terms, vbmeta acts as a digital seal of approval. When your Samsung M31 powers on, the bootloader checks the vbmeta partition to verify that the system, boot, and vendor partitions haven't been tampered with. This is part of Google’s standard. Samsung’s "anti-rollback" prevents downgrading
Do not attempt to modify vbmeta on your Samsung M31 without the following: