Bitcraze Forums

I'm in a similar situation.
I was updating the Crazyflie 2.0 from IOS app.
It failed, I turned off the quad and turned it back on.
Only M2 is lit solid. It is not getting into bootloader mode no matter how long I press the on/off switch.
On/off switch doesn't have any effect on the status on M2.
I measured the voltage between Vcc and Gnd. Its zero.

How can I reset the board?

Can you try and get into the bootloader mode from en unpowered state. E.g. hold the button and then connect the power (USB or battery).
The failed flash probable left the nRF51 FW in a state where the button is not working. Starting it from an unpowered state then the booloader is the first thing to run which can read the button correctly.

Hi Tobias,

That worked. I kept the on/off button pressed while connecting the power source.
It started in bootloader mode and I updated it using ios client.

Thanks for your advice!

It is working but there seems to be some problem with the gyro now.
It stays disoriented and is not calibrating.

Answered you in other tread.