wget https://download.mikrotik.com/routeros/7.14.3/chr-7.14.3.img.zip
unzip chr-7.14.3.img.zip

(Replace 7.14.3 with the latest stable version)

  • If you used passthrough for USB, try connecting the USB installer directly to the host and presenting it to the VM.

    • Depending on your installation method, use one of these solutions:

    If you must use the legacy ISO (e.g., for a specific old device), try these three fixes in order.

    To fix a problem, you must first understand its origin. The "Fatal Error: No CD-ROM found" is a legacy artifact. The standard MikroTik NetInstall CD image (the .iso file) was designed in an era when IDE optical drives were universal.

    If you are installing RouterOS on a standard computer (e.g., an old desktop, a mini PC like an Intel NUC, or an industrial PC):

    Solution 1: Switch USB Ports

    Solution 2: Change BIOS/UEFI Storage Settings

    Solution 3: Verify BIOS Boot Mode (UEFI vs Legacy)

    For most users, Netinstall is the official, supported method to install RouterOS without any CD-ROM.

    This completely bypasses the CD-ROM requirement.

    Date: October 26, 2023 Subject: Troubleshooting "Fatal Error: No CD-ROM Found" during RouterOS Installation Severity: High (Prevents OS Installation)

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