Welcome to Android Central! I think the 3e is just the version of the recovery menu. Nexus devices have the same recovery menu.
So if you select "wipe cache partition" in that menu and press Power button, nothing happens? Do you see a bunch of text at the bottom of the screen after selecting wipe cache partition? Once the process is done, you should then select "reboot system now."
If nothing is happening, the firmware may be corrupt. There's a
support site where you can download firmware, but there aren't any instructions on how to do so. I'm not sure if there's any way to contact Ainol support directly. This is, of course, one of the major downsides of these budget off-brand devices--minimal to no support.