3. Save the file back to the memory card, and then rename the config file by deleting ".BAK" suffix in the name, leaving the file named "SYNC_PARA.CFG".
4. Finally, with the camera turned off and the memory card and it's revised config file in the card root folder, simply turn the camera, turn the camera on and you're done! The camera will detect the renamed config file and load in the parameters when it turns on, and will write a new ".BAK" file to the memory card confirming the settings have been loaded (check to be sure this file is there). Leave this file on your card for future reference or changes. The file is rewritten every time the camera boots, so there's nothing gained by deleting it.
NOTE! There are some settings that can conflict with others or the camera cannot accept due to hardware limitations! In those cases the camera FW will change the invalid setting to a valid alternative when the file is loaded into the camera, and the revised settings will show in the config .BAK file that is written out to the SD card. If your expected settings are not working you can check the .BAK file to see the change. The Windows mSetup.exe programming software will not accept these invalid settings, so use it to make trouble-free configuration changes if you have a Windows PC.
Alternate Manual User Configuration Setting Procedure Via Camera's Video Out OSD
The M4K also has an On Screen Display (OSD) mode that can display/change its configuration settings via the camera buttons, but it's only available when the camera is connected to a TV, FPV display, or other system that accepts old NTSC or PAL analog video input. This method is a bit unwieldy navigating through the various menus to toggle settings, but there are times when this might be the only method available. You must have the M4K USB-C Video Out cable with phono plugs to feed the OSD video to your display hardware. More details on this are in Isoprop's User Guide linked above.