Firmware update issue "upload failed dfu device disconnected"

Posted on Wed 12th, April 2017

• #1

reynish
I'm having difficulty updating the firmware on my puckjs. Once in DFUTarg mode;
- if i try to upload the firmware in NRF Toolbox i get the message "upload failed dfu device disconnected"
- if i try try to do it using NRF Connect, when I select the device I get a connecting spinner and never get the DFU icon in the menubar shown here https://www.youtube.com/watch?v=N3CJbl29vy0
Any ideas?
• #2

Gordon

Have you tried a fresh battery? The DFU update uses quite a lot of power, so if your battery is on the way out then the DFU process can cause the battery voltage to drop too low, which will make Puck.js reboot
• #3

reynish in reply to @Gordon

Thanks Gordon,

I left the battery out over the weekend and when I tried updating it today it worked first time.
• #4

Gordon

Great! It'd be worth checking 'Puck.getBatteryPercentage()` to get an idea how full it is - if it's running right down then stuff like the Magnetometer might not work.

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