LX9 firmware needs several tweaks to the interface, transducer ping on/off option for those who just want to use the camera and not listen to the constant ticking, additional screen view configurations, optimize the GUI so onscreen navigation moves faster (video playback screen in particular) additional quick key shortcuts, shallow water transducer gain fix they implemented for the LX6/7 years ago...etc
I submitted all of these ideas and others to Marcum years ago....it's been almost 4 years since their last LX9 firmware release...