I just loaded 0115_app.hex without incident. Then I loaded 0118_app.hex by itself and all appears normal. I went back and forth reloading these two versions without incident. I have not attempted to load 0118_sys.hex yet. 
One trick that I use is to rename the file extension .hex > .xeh so I can keep the file on the USB drive and go back to it later if needed. Only rename to .hex for the upgrade that you want to load. The reason that I reverse the file extension characters is so I don’t have to remember what it used to be. Just reverse again to get back.
The file save is fixed for BMP and the “m” key now saves the current configuration (screen reports “save current settings” unless you have “savefile” displayed). Even with “savefile” displayed, it still saves the config but doesn’t report it. The screen brightness, sound vol, and increased capture buffer scroll speed works in both updates. There must be something else changed in 0118 that I haven’t noticed yet, or it needs 0118_sys.hex to show those displayed changes, or they are non-visible fixes.
I created a dummy .dat file and saved a .dat file. Does anyone know what format this is? What program can view it? It is the same size as the .BMP files so it must be some variation of screen capture.