I'm also having issues, but it already starts with finding the right firmware. It seems on Lexus-Tech.eu you can no longer download firmware updates for the Premium Nav unit (13MM which is in our 2013 IS 300h).
Therefore the question would be: does anyone have the latest firmware for the 13MM system or know some trick to get it from Lexus Tech or elsewhere?
These are the options the Lexus-Tech.eu website presents when searching for new software updates - the 13MM system is missing from this overview.
But when you have the mouse thingy in an IS from 2013, you have the 13MM system. The 13CY system is the one with the rotary controller I believe. (Also, when you click More Info for 13CY, it shows the latest software version and that software version does not show up as a software version for the Premium Nav system )
According to the bluetooth information on Lexus-Tech.eu, the latest firmware is for the Premium Navigation (13MM) system is: VD12104B.
