Unable to get puck to stay in bootloader mode.

Ok .. something definitely to do with the driver because this pops up in the logs:

[Tue Aug 22 14:49:26 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:49:28 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:49:37 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:49:39 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:49:45 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:49:47 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 14:50:00 2017] Bluetooth: hci0 command 0x0c1a tx timeout
[Tue Aug 22 15:01:30 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:01:32 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:01:34 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:01:36 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:01:51 2017] Bluetooth: hci0 command 0x0c1a tx timeout
[Tue Aug 22 15:12:17 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:12:19 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:12:22 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:12:24 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:21:07 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:21:09 2017] Bluetooth: hci0 command 0x200c tx timeout
[Tue Aug 22 15:22:25 2017] usbcore: deregistering interface driver
btusb [Tue Aug 22 15:22:25 2017] Bluetooth: hci0 urb ffff9b81a786e6c0
failed to resubmit (2) [Tue Aug 22 15:22:49 2017] usbcore: registered
new interface driver btusb [Tue Aug 22 15:22:49 2017] Bluetooth: hci0:
Firmware revision 0.1 build 82 week 37 2016 [Tue Aug 22 15:25:24 2017]
Bluetooth: hci0 command 0x200c tx timeout [Tue Aug 22 15:25:26 2017]
Bluetooth: hci0 command 0x200c tx timeout [Tue Aug 22 15:25:43 2017]
Bluetooth: hci0 command 0x0c1a tx timeout [Tue Aug 22 15:27:35 2017]
Bluetooth: hci0 command 0x0c1a tx timeout [Tue Aug 22 15:29:45 2017]
Bluetooth: hci0 command 0x200c tx timeout [Tue Aug 22 15:29:47 2017]
Bluetooth: hci0 command 0x200c tx timeout

I'll chat to the bluetooth subsystem guys see if I can get a definitive answer to what is going on.