bootmgr is corrupt

I have tried installing Windows 10 on my 2013 rMBP

Ran bootcamp with a iso from Microsoft website

Bootcamp creates the usb drive and I select 150GB to partition for the install

windows 10 installs fine and reboots

on rebooting i get the following message

Bootmgr image is corrupt. the system cannot boot

I have ran diskutil list in terminal details below

Darren@Darrens-MBP ~ % diskutil list

/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 - Data     139.8 GB   disk1s1

   2:                APFS Volume Preboot                 81.3 MB    disk1s2

   3:                APFS Volume Recovery                525.8 MB   disk1s3

   4:                APFS Volume VM                      1.1 GB     disk1s4

   5:                APFS Volume Macintosh HD            11.2 GB    disk1s5

so far i have erased the drive and reinstalled Catalina fresh but still get the error above on trying to install bootcamp

yet again I have removed windows 10 via bootcamp other wise all i get is the above error and unable to boot OS X unless i use the options key to select it

any help is much appreciated