Bitcraze Forums

As part of a research project at the Technical University Berlin, I am currently implementing some nonlinear state estimation algorithms on the Crazyflie 2.0.

Sometimes, after flashing the Crazyflie over radio, the Crazyflie does not restart properly and shows two red lights (no blinking) instead. What does that mean?

This is a 'Hard fault' condition, this is most likely caused by an error while flashing. The only solution currently is to flash again.

This is something that we have not seen for years and that has appeared quite recently, we do not know what is happening yet but we plan to look at it. The first things we should do is to add a check of the firmware in the bootloader so that the bootloader can re-flash pages that are in error automatically. I have created a ticket about this.