Vbmeta Samsung M31 -

./vbmeta --make vbmeta.img

| Error Message | Most Likely Cause | How to Fix It | | :--- | :--- | :--- | | | The patched VBMeta is incompatible with your current firmware or was not flashed correctly. | Re-flash the correct patched VBMeta for your exact firmware version. | | "AVB Fail / HASH_MISMATCH (3)" | The Android Verified Boot process detected a mismatch because Magisk or another tool incorrectly modified the VBMeta inside the AP tar. | Do not use a patched AP file . Instead, extract the original vbmeta.img from your firmware and flash the patched version separately, as described in Method 2 . | | Phone stuck in a boot loop or Download Mode | The flash was unsuccessful, or the device failed to boot into the new recovery. | Immediately force reboot into Recovery or Download Mode using the hardware key combination. If that fails, flash the full stock firmware using Odin to restore your phone. | | "Only Official Released Binaries Are Allowed" | The bootloader is still locked, or the KG (Know Your Customer) state is locked. | Re-check OEM Unlock in Developer Options. On some Samsung devices, you may need to wait 7 days after a factory reset for the OEM Unlock option to appear. | | Stock recovery keeps coming back | The phone was allowed to boot normally after flashing. Samsung's stock recovery will automatically overwrite a custom recovery on the first boot. | Always uncheck "Auto Reboot" in Odin, and manually boot into recovery immediately after flashing. |

Because you disabled Auto Reboot, your phone will remain in Download Mode. vbmeta samsung m31

If you follow this guide, your M31 will happily run custom kernels, Magisk root, and GSI ROMs without the dreaded "Official binaries" error. If you ignore vbmeta, you will be staring at a yellow warning screen forever.

This usually means there is a mismatch between your device security binary status and the file you are flashing. | Do not use a patched AP file

Modifying system partitions carries inherent risks. Ensure you fulfill all these prerequisites to prevent bricking your Samsung M31.

VBMeta stands for Verified Boot Metadata. It is a critical component of Android Verified Boot (AVB) 2.0, a security feature introduced by Google and adopted by Samsung to ensure the integrity of the device's software. | Immediately force reboot into Recovery or Download

While still connected, press and hold the keys to force the phone out of Download Mode.

stands for Verified Boot Metadata . It is a core part of Android's AVB 2.0 (Android Verified Boot) architecture.

. Its fundamental purpose is to ensure that the software running on the phone has not been tampered with by unauthorized parties or malware. If the bootloader detects a mismatch between the stored hashes in the vbmeta partition and the actual state of the system partitions, the device will trigger a "Security Error" and refuse to boot, protecting the user's data from potentially compromised firmware. Vbmeta and Customization

To bypass this security check and boot your modified software, you must flash a file that instructs the bootloader to ignore signature mismatches. Prerequisites Before Flashing