My Inspiron 7459 is running with BIOS version 1.6.0. Yes, I know, the "Drivers & downloads" section of the support page shows the latest BIOS as version 1.5.0. Nevertheless, mine has 1.6 installed. I installed v1.6 myself and I guess Dell subsequently removed v1.6 and replaced it with the older v1.5.
I'm wondering whether I should revert back to 1.5.0?
The machine exhibits some strange behavior (I use the HDMI in to support a second computer and sometimes the 7459 won't wake up forcing me to unplug the power and start anew, yesterday I had to move the mouse on Dell machine to get the second machine to awaken etc) I wonder whether this 'unsupported' BIOS has anything to do with it.