Since this is a .qcow2 file, "updating" usually implies one of two methods:
QCOW2 is the native disk format for QEMU/KVM:
fgtvm64kvmv723fbuild1262fortinetoutkvmqcow2
# Standardized Naming Convention VERSION="v7.2.3" BUILD="b1262" PLATFORM="kvm" NEW_FILENAME="fortigate_$VERSION_$BUILD_$PLATFORM.qcow2"
Missing delimiters (underscores or hyphens) suggest the string was concatenated programmatically without proper escaping.
: Indicates this is a 64-bit FortiGate image optimized for the Linux KVM platform. v7.2.3 : The major and minor firmware version.