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Okey, now i flashed it. How do i turn the OW function of and force the deck driver?

I looked through the code and I don't think the OW should trigger the self test failed. There might be some other error.

Try building the firmware forcing the Loco deck. Some info can be found there how to do it. In you config.mk use these flags:
DEBUG=1
CFLAGS += -DDECK_FORCE=bcLoco

Let me know how it goes.

I think I did what you said and got the result in this picture. At the bottom it says self test ok but the led still blink 5 times fast.

Also I found an error in my commands, it should be:
DEBUG=1
CFLAGS += -DDECK_FORCE=bcDWM1000

There is a param called system.selftestPassed. Set this to 1 after the CF2 has booted and you will force a startup. Then test if it seams to work as it should.

Okey, now i tested this with the new code and the param system.selftestPassed to 1 and this made the loco deck start blinking as if it would work. But it still would not connect to the radio in the cfclient. I show you the console and my terminal window.

A side note is that the loco deck and crazyflie card got a bit warm by just being in this mode, does it always get a bit warm or does that indicate something?

The CF2 and loco deck will get a bit warm so that is probably fully normal.

It looks like the client is getting stuck in the startup of the communication and it is hard to debug without the problematic HW. You are getting the console info over the radio right?

Do you have the latest cfclient running?

Okey.

I am using the USB to get the console info, since it will not connect by the radio.

Yes I got the latest cfclient.

Hmm, this puzzles me a lot. Would it be possible to send your board to us so that I can have a look at it. Too hard and to slow to debug on the forum. If so send us a mail support(at)bitcraze.io