The instruction given to me direct from highly regarded people in Meridian support was to reTYPE all units immediately following a firmware upgrade. I have simply passed this information on.

It may not be absolutely necessary on all upgrades, and some assume that it is performed automatically when using some tools, but for the sake of a few seconds, its a belt and braces approach that may well prevent problems down the line.

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