: This usually means an older version of the app is still on the device. Go to the Uninstall menu, remove the previous version entirely, and then try the 6868hx installation again.

If your “6868hx” refers to a printer controller firmware (common in HP DesignJet or Epson SureColor large-format printers), the process is completely different:

Open your PC case, find a compatible slot (usually x4, x8, or x16). Remove the rear slot cover.

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