41CL self-update via embedded serial port

[smp]

Please provide some hints for the utterly dense, like me.

The directions refer to a file UPDAT-3B.ROM. I have UPDAT-2B.ROM left over from last time. Where do I get UPDAT-3B.ROM?

Also, where do I look to get the files and the directions for installing YUPS?

Thanks. Sorry for being such a dummy on this.

smp