@bearer M20 shows 0 files.

@Phaedrux Right. That part I understand. I mean, to get the software back on the SD card to run the duet.

@bearer Thanks. I have already started that format process. I have SD Card Formatter for the Pi. Where can I get some really clear instructions for getting the system back on the SD card that doesn't assume I know what I'm doing? I was able to follow the instructions for getting the firmware updated, but that was not started from scratch. Once I get to DWC, I was much more comfortable in learning how to make changes.

@Phaedrux This is what I get. I don't think it sees a card.

How do I do that? Can I do that from YAT? If I try to look at it on the PC, it wants me to format it.

Duet2 Wifi and Duex on a RailCore - CoreXY. I'm a newbie, in the newbiest sense. I had the cards working great. I had JUST finish tuning all the settings - and of course, hadn't backed up my config file. Then, for no apparent reason, the printer stopped connecting to the DWC interface. If I use the USB and connect with YAT, I can get it to tell my my fireware and such (see screenshot) and it will connect to my wifi and even show up on my IP list on the router. But when it's plugged into the USB and I try to connect with DWC, I get this: Your Duet rejected the HTTP request: page not found Check that the SD card is mounted and has the correct files in its /www folder. If I disconnect the USB, DWC just says it timed out. Is this just an SD card that went bad? I tried typing M503 and I just get OK. No other feedback. I don't pretend to know a lot of gcode. Just learning on the fly, usually when something goes wrong.