I have a UR824 and I am just wondering how risky it is to update the firmware?
I have updated the interface yesterday. Everything worked fine.
The update archive contains a pdf file with a few update instructions and warnings (No power interruption while update / close all other program).
Here (on a Mac), it was very easy: download the software from the dspMix console, and let it do the update. Done.
On Mac, no problem for me too