This thread is from so long ago (three years), that an updated firmware will allow you to change the MIDI Channel directly on the the instrument... no Sysex messages necessary! (You will be happy to know).

The best way to sort this out is to make sure you update your refaceCS to the latest firmware (currently 1.30)
This comes with a Supplementary Manual that outlines the routine for setting the MIDI Channel. Outlined below:

While holding down the A3, C#4, and E4 keys, switch to On. This activates Advanced Settings Mode.

In this mode, all of the OSC [TYPE] lamps light up, and you can change parameters by using the keyboard.

While holding down the D#2 key, press a key between C3 and E4.

Whenever you press a parameter selection key or a setting key, the lighting condition of the OSC [TYPE] lamps changes accordingly. No sound is produced during the setting process.

Release the D#2 key and confirm that all of the OSC [TYPE] lamps light up. This indicates that your setting has been saved.

Press the [o] (Standby/On) switch to turn off the instrument and exit Advanced Settings mode.
In order to avoid changing other parameter settings while playing, be sure to always exit Advanced Settings mode after changing settings.
Settings made in Advanced Settings mode are retained after you turn off the instrument

I also read the midi primer and understood There are files to use in a DAW to set the midichannel and to make a bulk dump request.

But i can’t find the files to download.

Find the download HERE

Thanks.