vbmeta (Verified Boot Metadata) is a small but critical partition introduced with Android’s (AVB – Android Verified Boot). Its job is to cryptographically sign and verify the integrity of other boot-related partitions: boot , system , vendor , dtbo , and more.
When you supply the --disable-verification flag during the flash process, you are modifying the verification metadata stored inside the vbmeta partition. Specifically, it: vbmeta disable-verification command