@Stromkiller All the information is here: VisionFive 2 Debian Image 202302 Released
It has a link to the firmware: Release VisionFive2 Software v2.10.4 · starfive-tech/VisionFive2 · GitHub
You only need u-boot-spl.bin.normal.out and visionfive2_fw_payload.img .
The instructions to update the firmware are here: https://doc-en.rvspace.org/VisionFive2/PDF/VisionFive2_QSG.pdf (Section 4.3)
Or you can try to change the boot switches.