Looks like Keysight recently released new firmware for the 34460A/34461A/34465A/34470A series of bench DMM's.
Firmware here:
https://www.keysight.com/main/software.jspx?ckey=2367633&lc&ccRelease notes here:
https://www.keysight.com/upload/cmc_upload/All/Firmware_2_17_Release_Notes.pdf34460A/34461A/34465A/34470A Revision 2.17 Enhancements and Fixes
1. Firmware modifications to support and recognize the new measurement board within the instrument.
2. Resolved a defect that caused the DMM to down-range with a 1000V range specified in the
CONFigure:VOLTage:AC command together with SENSe:VOLTage:AC:RANGe:AUTO ON, thus producing
two readings.
3. Resolved a defect where the DMM would incorrectly accept negative values for
CALCulate:SCALe:DBM:REFerence.
4. Resolved a defect where CONFigure:VOLTage:DC and CONFigure:VOLTage:DC:RATio would not set the
impedance (Input Z) to ‘Auto’.
Doesn't seem like anything too major but it is interesting to read about a new measurement board - perhaps they have made a change with respect to the whole maximum voltage issue?