There are not currently any hardware upgrades, other than the display window replacement.
Here’s a little utility that diagnoses and fixes common problems with patches saved from earlier firmware revs: http://staging.futureson.us/patchfixer/
That patchfixer page will also allow you to change bank/slot/name and save the modified file.
There have been many different symptoms described as a “whine.” If there is background noise at less than -72dB, then your unit is functioning normally. If there is a louder whine, let me know so we can troubleshoot.
There is a Ctrlr panel: Parva Ctrlr panel
and a TB MIDI Stuff panel: Parva iPad Editor (TB MIDI Stuff panels)