Has any -12 owner performed this upgrade process and what issues if any did you have to deal with. Losing settings etc. I've read the Dynon and Vans documentation for the upgrade and it doesn't give a good feeling. I currently have 5.4.0 and don't really have any issues.
Yes, I have done it and I explained in the other thread you started, what type of issues you could encounter.
It is not tough to do because there is a settings file that is part of the software load file on the downloads page of Van's web site
https://www.vansaircraft.com/wp-content/uploads/2019/01/12-D180-PRE-SETS.pdfthat should load most all of the perimeters for you if they get over written during the software upgrade.
There is also a presets text file available
https://www.vansaircraft.com/wp-content/uploads/2019/01/12-D180-PRE-SETS.pdf that can be used to step through the manual set-up menus and confirm that everything is configured as it should be.
The general instructions for doing the update is at
https://www.vansaircraft.com/wp-content/uploads/2019/01/RV-12-D-180_support_instructions.pdf
Note that Van's doesn't recommend updating beyond 5.5.0. That is the highest update with an integrated settings file that is available on the Van's web site. The changes made in 5.6 were not considered relevant to the RV-12 so an update file was never produced and posted to the web site. If you choose to download and install 5.6 from Dynons web site you will be forced to do a manual set-up if any parameters get over written.
I do recommend updating to 5.5.0 because it gives you a canopy unlatched warning functionality (requires installation of a switch and wiring to make it functional)
As I mentioned in your other thread, there are only a few parameters that have gotten over written in some cases for unknown reasons (possibly related to a specific release) I am not aware of anyone having that occur when updating to 5.5.0 but following the recommendations in the instructions document, to take photos before hand of all of the different set-up pages, would still be a good idea.