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Pugsy wrote:I don't think the older 50 series models had the mask leak/fit thing available...don't worry about it. Likely depends on the firmware/software in the machine itself. Not missing much. The video is likely based on a newer model.

My 550P had the mask check feature available with firmware version 2.01. I believe it can be enabled via the clinician's menu only when the machine is set to Auto mode, but I will double-check.

Drowsy Dancer wrote: My 550P had the mask check feature available with firmware version 2.01.

The 550 I had didn't have it but the firmware was older than 2.01. So it may have been added with later 50 series firmware.
I don't remember the firmware version but it was less than 2...I m pretty sure of that. Date of Manufacture for the 550 I had was also fairly early into production if I remember right.