Add/remove Software Via Network Using Sharp Rom

[tsmori]

After recently going back from OZ to the Sharp Rom (using the Trisoft NAND restore), I've noticed the option to add/remove software and there's a "via networks" button.

Clicking that button shows some options to add servers from which to (presumably) download and install software.

The question is, which server(s) can I use?

[tanheis]

Is it needed to do NAND restore when going back?
Or is it only for Sharp ROM?

Going back to Cacko from OZ doesn't need NAND restore.
Went just with flashing the new ROM.

[tsmori]

I have a C1000, for which there isn't a current Cacko ROM, so to go back to a Sharp-based ROM, the only option is to do a NAND restore. (From what I can see anyway).