As I said, I connected directly (also) via cross cable. Why the need for a router only to connect 2 devices, physically connected only to each other, each with unique IP address ? Especially if these are already working this way very well in non-safe mode.
Default SBC subnet mask address is 255.0.0.0 and I didn't changed it – but I also suspect there is no way to change this while in safe mode. Also on PC were the same 255.0.0.0 mask address, which is set (autocompleted) automatically when I specified an 10.1.0.xx local address (where xx was 99 and later 9). At the same time all these settings are working very well in non-safe mode.
Internet ? No need for internet here. Again, what has to do the internet with 2 devices, physically connected only to each other, each with unique IP address ? The final device is a rackmounted relay-based video bypass switch, that has nothing to do with the internet – at least not the physical network segment where the SBC65EC is involved.
This (the subject) is specifically about forgotten password (or username). Even if I informed the end user that he must take care of the chosen username and password, I also need to offer him a solution just in case it fails to do so. In one case I can go there and check the module with my PICKit, but generally speaking this is not a solution (and gives a bad reputation of the overall product – I mean the one which I built).