You can access the device with telnet by booting a different kernel with a USB-Stick.
This is only for hardcore Linux experts who can mount filesystems and use the shell. Be aware that you can lose all data if you make a mistake.
Connect the Mycloud to your router (with DHCP server).
Boot the system from USB-Stick.
Telnet into the device (no password).
Save your data first over the local net.
Setup a completely new device (with loss of all private data).
You can unplug the boot USB and plugin an external USB device to save your data. Mount the new device and use tar for bulk copy.
Follow instructions here:
http://fox-exe.ru/WDMyCloud/WDMyCloud-Gen2/
