Yesterday I installed 03.29.00 Rev 18 firmware on my fmc003 (03.28.03_97) using TCT. Just in case, I saved the configuration beforehand. But during the update I did not have to use the configuration file since the configuration were not reset.
Normally, you may not open the original.cfg (1.7.38) on the new configurator (1.7.72) as the Base Firmware of these Configurators was different since some additional options or settings have been added on the new Configurator which is why you were receiving some errors.
Suggesting you Open and load the correct Configuration based on the Firmware version so you will not receive any errors from the device.
Thanks for your advice. I put my plan into action - upgraded the firmware in the ‘old’ FMC920 and the latest configurator could then read its settings which were still there. So I saved them to my PC and I’m sure I will now be able to configure the new devices.