For all those who need a patched VBMeta.img to disable verifications (remembering that fastboot is not available), installing TWRP and it won't let you do it because of this error "Error verifying vbmeta image: invalid vbmeta header (6)", you need to flash this image that I modified. It's based on the A505FDDS9CWA1 XSG firmware, it's made for the A505F model and its N or M variants. I'M NOT SURE IT WORKS FOR OTHER MODELS, but you can ask me to modify VBMeta.img's for other versions / models...Read more