BPanther's Neutrino VU+ 4K MultiBoot:
VU+ 4K MultiBoot - BPanther's Neutrino Forum
Quote from BPanther:
Important
If you want to go back to normal operation, take the files of the image to be flashed, but when you first switch to normal boat, it must be the initrd_auto.bin
to be used (vuuno4kse_flash_rev20615-ddt), otherwise the image will not start, since the start area is still wrong (on multiboot and no longer existing or now invalid partition).
Only then can you flash a "normal" image as usual with the files supplied by the image.