Cannot connect to CHUCK on Parrot Disco

Hello, I am trying to connect to a CHUCK in a Disco but am getting “Connection refused”. I have tried both telnet and ssh using PuTTY on Windows 10 and command line on Linux. Also, FTP works (WinSCP) and I can ping the IP (192.168.42.1) just fine.

Also, this is one of a pair of Discos bought together around couple of years ago or so. I had converted one to Ardupilot without any problems back then. This is the other one, not converted back then and taken out of mothballs now. Any idea what the problem might be?

OK, I figured it out after contacting Parrot tech support. After booting the CHUCK, you need to do a double press on the button, the pitot sensor will flash light blue - purple and then start flashing blue again. After that, you can connect to telnet at 192.168.42.1