Firmware update issue "upload failed dfu device disconnected"

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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?

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