HP41CL Serial Com Port Failure

[Neve]

Greetings everyone,

A few weeks ago I updated my HP41CL’s with the latest rom 220722.zip.
Today I wanted to check something. I plugged in one of the CL’s to the serial cable, as I normally do to update it with Sylvain’s Java program on my Mac. When prompted with «Waiting for 41CL commands», I EXQ CMOPEN on the 41. Except that now it doesn’t link, and I get a timing error.
I tried another CL, and I get the same thing…. No connection to the Mac.
My serial to USB is good and recognized by the à Mac as /dev/ttyusbserial, as it always has…

I don’t understand what’s wrong. Was a bug inadvertently introduced with the latest rom mentioned above?

Thank you for any help anyone can provide.