I use Linux on my main desktop, so I never use the companion software. So I do all my firmware updates manually.
- Download the latest firmware file: http://updates.irexnet.com/companion/dr1000/device.zip
- Extract the System directory to the root of your memory card
- Unmount you DR1000
- Unplug the USB cable. It will automatically detect the update and ask you if you want to install it. Select Yes.
It's as easy as that. No companion software necessary.