UDP is "fire and forget." If a switch buffer fills for 1ms, a packet is lost. A professional multicast upgrade tool addresses this via:

Real-time visualization of how much data is hitting your uplinks.

: Syncing configuration files and software versions across an entire office of IP phones. How it Works Initialization

The best tools allow the multicast client to run inside the device's bootloader (e.g., U-Boot). This is crucial for "brick recovery"—pushing a new OS to devices that cannot boot their primary kernel.