Hello!
I have a strange problem with USB on my N810 for last two weeks.
Actually, it looks like a constantly turned on USB host - the USBControl program shows a "a_wait_bcon" mode whatever I press.
The tablet can begin hanging and making strange things, can show "USB Device is not supported" message... and it began to eat the battery in some 10-12 hrs!
I have done the full clear but the problem persists.
The worst bug is that I can't reflash the device - it is not seen by PC neither in "normal" mode nor after switching on with Switch button (although the USB sign is displayed). I have tries to find it both in Windows and Linux. There are no new USB devices when I connect my N810 to PC...
I have read that and that topics, but there are no answers...
What should I do? Is it a hardware problem with a "magic" pin that turns the device into a USB-host mode?

My thought it to flash the device from itself. If you install penguinbait's "copy internal to SD" tool you can use it to flash a boot menu on your device. Then you can get an install on a SD card and try that.