Hi Jonare
I just ran the upgrade on a R2310. Worked fine. Dunno about that "matrix-command."
It does upgrade from BOOTROM to version 139. (I was at 132). So it reboots again after that.
I also patched R2416 with the system-patch-r2416h01.
I've attached a transcript (partially*) of the console during the process. Gives you an idea . .
*I've edited out all those (tabulated completions) and loong display outputs.
Regards