Google introduced Android Verified Boot (AVB) to guarantee that all executed code comes from a trusted source rather than an attacker.

: Transfer this TAR to your M31, open the Magisk App , and use the "Select and Patch a File" option on your new TAR.

Disclaimer: This process will void your warranty, trip Knox (permanently disabling Samsung Pay and Secure Folder), and wipe your data. Proceed at your own risk.

For those interested in learning more about vbmeta and its significance in the Samsung M31, here are some additional resources:

In turn, vbmeta checks the cryptographic signatures of boot.img (kernel), recovery.img , and system partitions.

You have two options to obtain vbmeta.img for your specific M31 firmware version.

Keywords used: vbmeta samsung m31, samsung m31 vbmeta patch, sm-m315f vbmeta, disable avb samsung m31, custom binary blocked vbmeta m31.

: Use a tool like Frija to download the latest M31 firmware.

You flashed a custom recovery without patching VBMeta. Fix: Flash the patched VBMeta .tar file in AP slot before flashing TWRP. Then flash TWRP in a separate Odin session without rebooting.

Whenever the Samsung M31 powers on, the bootloader checks the vbmeta partition against the actual contents of your system partitions. If everything matches (the “verified” state), the phone boots normally. If there is a mismatch (e.g., you flashed a custom kernel), Android Verified Boot (AVB) kicks in and prevents the phone from booting to protect your data.

so you can manually boot into recovery immediately after flashing. Common Issues & Solutions

: Move the resulting magisk_patched.tar back to your PC and flash it using Odin in the AP (or sometimes USERDATA ) slot while the phone is in Download Mode . Option 2: Using a Blank/Disabled VBMeta