Dfds

I'd suggest starting by having a look at this thread: You mentioned that you wanted to use VMM, sadly as the N54 has an AMD CPU that won't be possible as it's only supported on Intel CPU's. As for your data it should be ok, however you should always have a backup just in case things go awry.

Try the 1.02b loader & DSM 6.1

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I can't answer that I'm afraid as I don't use virtualbox. What version of DSM are you running?

In that case it must have been an update to DSM itself.

Have you tried the DSvideo app?

@moretty As he thanked Seba the creator of virtualbox4dsm I'd assume he updated to virtualbox 6.1.4

The ReadyNas Duo uses an ARM CPU so isn't compatible, you need an x86 CPU preferably Intel.

Glad you're up & running.

I've just created a new loader USB (in windows) & checked it with disk utility in a MACOS VM & it's also showing as non bootable so I think that's a red herring. Have you checked the HP's bios settings is set to boot from the USB?

If you had used the search function as @jensmander suggested you would have found that you need to mount the img file with osfmount

A quick look in the FAQ's would have resulted in this thread:

Install the full 6.2.3