I’ve tried to update but no success. I’ve used an König cable 146/2 USB to RS232 with the baby blue Cisco RS232 to RJ45 cable as linked in the first post.

The Kónig worked without the Cisco cable connected but had some trouble with the Cisco connected. Failure 10. Got around that but with the DSP connected same failure, the app tried to update but the DSP wasn't visible. It tried to update but it couldnt reset the DSP. So I had to turn them off and on as told by the updater. The connection became unstable every time.

Perhaps someone knows what went wrong for future reference for other readers.

I have now ordered a RS232 gender changer so I can use an old laptop with a serial port with the Cisco cable. Hope that works.

Some Meridian...