There seems to be an issue when the updater is used with some types of USB/Serial converters - especially those based on the prolific chipset.

Meridian have introduced a throttle/interval on later versions of the flash loader which, if you experience problems, may be worth adjusting so see if it fixes the problem. I think you access this interval from mconfig -> view/options/serial port.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).