Virtual machine deleted after firmware update

I updated the QTS firmware on my TS-264 to QTS 5.2.9.3499. After that, my virtual machine in Virtualization Station was no longer available. I then tried to import the machine. However, in the directory of the virtual machine, there is only an img file, which can’t be imported.

After that, I created a new VM and attached the img file as a hard disk. But the VM won’t start.

What can I do to get the virtual machine working again?

Kind regards

Moved to the German subforum, please pay attention to the language!