I was trying to delete windows 10 from macbook pro mid 15 macOS Mojave 10.14.1. I couldnt delete the partition as it was Windows NFTS and it was greyd out. So i choose something from the list gave non space to bootcamp windows in diskutility app and it automatically deleted bootcamp partition and gave macOS all the space. But the BootLoader is still showing windows when mac is powered on using the option (alt) key. The problem is I don't have any idea what I have done and what I should do to correct it. I don't want windows back. Following is the result when from terminal when I enter Code: diskutil list Code: /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *500.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk1 500.1 GB disk0s2 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +500.1 GB disk1 Physical Store disk0s2 1: APFS Volume Macintosh HD 238.5 GB disk1s1 2: APFS Volume Preboot 44.6 MB disk1s2 3: APFS Volume Recovery 512.8 MB disk1s3 4: APFS Volume VM 1.1 GB disk1s4 When i enter Code: sudo gpt -r show /dev/disk0 and respective identifiers it says "gpt show: unable to open device '/dev/disk0': Operation not permitted" with its respective number on dev/diskXX. But only on disk0s1 it shows: Code: start size index contents 0 1 MBR 1 40599 I'm a newbie to this part of computers. Please describe as detailed as possible.