I finally ended up liberating mine now, and it's working great!
I was a bit worried since I read posts about people losing calibration, serial number, and the mac address in different attempts.
But I noted down the serial and mac just in case and went for it (using tv84s instructions).
From reading other experiences, SCPI should have returned the full resolution even before the upgrade, but it did not. Both before FACTORY ON, and after, it was only 10mA resolution. Perhaps they changed that in the latest firmware, which is where I upgraded from. The additional digit did display on the device and with SCPI after the upgrade, so I'm satisfied. It's really nice to have 1mA resolution on current measurement.
There are a few mV difference between "set" voltage and "read" voltage (like others have noted), but the "read" voltage agrees pretty well with my multimeter, so that's fine.