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When installing older custom recoveries like , the developer's notes often explicitly state "Need to flash null vbmeta to boot" . This is because older recovery code might not automatically handle the newer AVB 2.0 standards, making a pre-flashed, disabled vbmeta essential for compatibility.
You will need to flash the complete, official stock Samsung firmware via Odin using the BL, AP, CP, and CSC slots to restore the phone to a factory-fresh state before attempting the unlock process again. Conclusion
Understanding Samsung Galaxy M31 VBMeta: The Complete Guide to Boot Verification and Flashing vbmeta samsung m31
Common scenarios:
Open Odin and load your patched vbmeta.tar into the or AP slot.
: Unlocking the bootloader and flashing files will completely wipe your device internal storage. I can provide tailored instructions for your exact
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Any modification involving vbmeta will trip Knox and void your warranty. An error here can lead to a soft brick (device stuck in a bootloop) or, in rare cases, a hard brick.
You can find pre-compiled vbmeta_disabled.tar files specifically created for the Samsung Exynos 9611 platform (which powers the M31) on reputable forums like XDA Developers. Alternatively, you can use the stock vbmeta.img extracted from your current firmware and patch it via Magisk on your phone. Step 2: Boot Your M31 into Download Mode Turn off your Samsung Galaxy M31 completely. You will need to flash the complete, official
Before proceeding with flashing or disabling VBMeta, ensure you fulfill these strict requirements to avoid permanently bricking your device:
A patched vbmeta image is often referred to as a "null" or "blank" vbmeta in development forums.
Download a generic or extract the stock vbmeta.img from your M31's official stock firmware zip (found inside the AP_... file).
Go to the tab on the left side of Odin and uncheck Auto Reboot . This prevents the phone from booting immediately before you can access recovery.