ReaR/UEFI: Booting the Rescue ISO fails at Grub Rescue prompt with error message "Unknown command 'configfile'"

Solution Verified - Updated -

Issue

  • When booting the ReaR Rescue ISO on UEFI systems, the Grub Rescue prompt is entered and following message is seen

    Unknown command 'configfile'.
    error: ../../grub-core/kern/fs.c:120:unknown filesystem
    Entering rescue mode...
    grub rescue> 
    

Environment

  • Red Hat Entreprise Linux 7 and 8
  • rear-2.4
  • UEFI

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