If your bootloader is already unlocked and you are still seeing the error, or if you are trying to pass SafetyNet/Play Integrity, you likely need to flash a specific vbmeta image.
Hit start. This replaces the stock signature requirement with a "null" check. Method 3: The "Nuclear" Option (Flash Factory Firmware) vbmeta error verifying vbmeta image ok-not-signed -3-
The error message is Fastboot’s way of saying: “The vbmeta image exists and is structurally valid (OK), but it does not contain a valid cryptographic signature (NOT-SIGNED), leading to a verification failure code -3.” If your bootloader is already unlocked and you
This comprehensive guide breaks down the technical meaning of the error, why it happens, and the step-by-step solutions to bypass or resolve it. why it happens