1. Standard host on Proxmox, BIOS=SeaBIOS. SATA0 reserved for loader img. add additional data storage HDD on SATA1. setup boot media from SATA0. add serial port for you troubleshooting. **Pay attention on network, use Intel E1000 instead of VirtIO ** - VirtIO cannot get IP address on network (My experience)   2. copy synoboot.img to /var/lib/vz/image, convert img to qcow2 by qemu-img convert, my qm host ID is 100, please modify to yours.  ** example: qemu-img convert -f raw -