Thanks for your answer Claire!
I'm currently experimenting with the range of the wixel, so I've used test_radio_signal_rx test_radio_signal_tx to test it. I want to be able to test the receiving end without being connect to a PC, but to a powerbank. When I used the original test_radio_signal_rx it didn't work when connected to the powerbank. So, I thought, if I remove the USB sending stuff, it won't freeze and it will indicate with the LEDs if it have received any packets. I didn't think of the fact that it need some of that stuff to get into bootloader mode normally using USB. Well well, I thought, I'll just reset it using the 3V3 and P2_2 as I've read many times. And now, it seems broken. If I connect it to my PC, the yellow LED is only glowing a tiny bit, the the application isn't running, and it isn't getting into bootloader mode. I don't have the exact code, but I based it on the https://github.com/pololu/wixel-sdk/blob/master/apps/test_radio_signal_rx/test_radio_signal_rx.c
and if I recall correctly I removed the void reportResults() chunk, the usbComService() string and the reportResults(); string. I maybe also removed the usbInit(); string also, I'm not sure.
Images of the wixel: