Help needed with braindead Nanokontroller 2

[Eric G]

Hi!
I'm new to this forum and I have a question regarding the Nanokontroller 2. I bought it second hand and it does not work.
- The power LED does not light up when connected to a PC. Tried two PC:s, two different cables.
- The PC does not find the Kontroller as a USB device. Not at all.
- The microcontroller inside the Kontroller does get 3.3V.
- The microcontroller does not turn the power LED on.
- The microcontroller's crystal oscillator does not start.
- The microcontroller does not pull the D+ up, but down. Hence not recognized as device.
So it's kind Catch 22, since I can't do anything from the PC.

Does anyone recognize this issue? Any help appreciated.

[Eric G]

Update:
If I patch the pullup to D+ the Kontroller i found on the PC, but is reported as an "Unknown USB unit (request for unit description failed)".
The microcontroller's code seems to be corrupt.

How can I program the microcontroller again? It is a Renesas DF2210CFP24V.

[voip]

Restoring the Factory settings might be worth trying. It is possible that there may be a second backup copy of the firmware kept in ROM, that gets copied to NAND Flash when this is done.

.

[Eric G]

Restoring the Factory settings might be worth trying. It is possible that there may be a second backup copy of the firmware kept in ROM, that gets copied to NAND Flash when this is done. .

That does not work since the microcontroller does not boot at all.