Bluetooth problems after upgrade

After upgrading to the latest firmware, my Edge 25 got sick. While riding the display is just nagging 'bluetooth connected' 'lost bluetooth connection' while beeping. After the ride I can't connect it to my android phone. I removed it to reconnect and now it's lost. I can transfer with cable to my laptop via Express. Is there a way to reinstall the firmware? Or even downgrade?

Thanks.