https://www.instructables.com/id/How-to-Hack-Upgrade-a-Rigol-DS1054Z-Digital-Oscill/
I had good success unlocking the extra features on both my DS1054z scope and DP832 power supply. O0
The clandestine Rigol upgrade site lists several different types of equipment:
http://www.gotroot.ca/rigol/riglol/
Nere, you can also get new firmware which fixes bugs and adds new features.
http://www.eevblog.com/forum/testgear/rigol-ds1000z-firmware-patch-plugins/