avbtool make_vbmeta_image --flags 0 --output vbmeta_custom.img
When you execute the command:
fastboot flash vbmeta --disable-verification vbmeta.img vbmeta disable-verification command
You are instructing the fastboot tool to perform a specific operation on the flags stored within the vbmeta partition header. avbtool make_vbmeta_image --flags 0 --output vbmeta_custom
When you supply the --disable-verification flag during the flash process, you are modifying the verification metadata stored inside the vbmeta partition. Specifically, it: In practical terms: You can now flash custom
In practical terms: You can now flash custom kernels, modify system files, or install Magisk (root) without the bootloader refusing to boot.