@cdmanii
I replaced 4 files, though serial number was only in 2 if I remember correctly.
JPEGs always (!) have 320x240 resolution, though you can see from the images comparision, that one image is way more "grainy" than the other.
What I was doing wrong is, that I only renamed original files (and add modified ones), not deleting them. As Flir uses some stupid system (if I remember correctly it looks by alphabet and looking for i.e. 15th file), it took wrong file.
Another stupid thing was, that I calculated CRC wrong for one file once (all files have same name, just are put in different directories).
About RDNIS you are right (settings menu, where version is displayed, then RIGHT (not play if I remember well!) button for 10 s), but with E40 you actually don't need it! Just connect camera to your home WLAN and then access to it via FTP.
Simplest "check" if you did E60 out of E40 is, that you check if "Thermal fusion" option is avalible. And offcourse in menu.
Hope this helps!
Regards,
Gregor