. It acts as the "root of trust" for Android Verified Boot (AVB) 2.0 , ensuring that the operating system has not been tampered with.

: Disable "Auto Reboot" in Odin options to prevent the system from overwriting your changes immediately after flashing. Common Issues: The "Invalid" Error

: Messing with the vbmeta partition will factory reset your device and can potentially hard-brick it if the wrong file is used. Always backup your data before proceeding.

: Download the official stock firmware for your specific M31 model (e.g., SM-M315F). Extract the AP slot file using a tool like 7-Zip to find the vbmeta.img.lz4 .

Put your M31 into (Power + Volume Down while connected to a PC).

The vbmeta.img file contains cryptographic hashes for other partitions, such as boot , system , and vendor . During the boot process, the bootloader checks these hashes. If it detects a modification—like a Magisk-patched boot image —it will trigger a security violation, often resulting in a or an "Error verifying vbmeta image" message. Why You Need to Patch vbmeta on Samsung M31 Samsung M31

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