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

: 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 .

For enthusiasts looking to root or install custom ROMs, managing this partition is often the most significant hurdle. What is vbmeta?

, simply unlocking the bootloader isn't enough to run modified software. Because Samsung uses a custom implementation of AVB, you must flash a modified or "patched" vbmeta.tar file to disable dm-verity and verification. This tells the system to skip the integrity check, allowing the phone to boot even with a modified recovery (like TWRP) or a rooted kernel. How to Flash vbmeta on Samsung M31