Here is what you can do, use bootutil utility to disable the ISCSI remote boot, Copy the bootutil.exe into a bootable USB drive, then boot from the USB drive to
enter into DOS mode. Please refer to the extacted list of command here:
Disables FCoE, iSCSI and PXE functionalities for legacy BIOS.
Enables port as iSCSI primary and disables PXE/FCoE for legacy BIOS.
Enables port as iSCSI secondary and disables PXE/FCoE for legacy BIOS.
Enables PXE and disables iSCSI/FCoE boot for legacy BIOS.
Enables FCoE and disables iSCSI/PXE boot for legacy BIOS.execute bootutil command to disable the ISCSCi boot,
For more information, please visti below link for reference: