install/52092: i386 image not recognised as bootable media by EFI environment on legacy Mac

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>Number:         52092
>Category:       install
>Synopsis:       i386 image not recognised as bootable media by EFI environment on legacy Mac
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 19 21:00:00 +0000 2017
>Originator:     Sevan Janiyan
>Release:        7.99.66
>Organization:
>Environment:
>Description:
Attempting to boot the iso image on a 2007 17" MacBook Pro fails as the EFI boot manager (accessed by holding option key on power up) does not recognise the media as bootable. Hence, no option is given to boot from the CD.
>How-To-Repeat:
Attempt to boot the i386 CD of a snapshot from head.
>Fix: