Template parameter make it easy to change values in templates without the need to change the templates. This avoids conflicts when the templates are changed with software updates. For example, parameters can be used to define firmware path for certain phone models.
If you are manually trying to upgrade the firmware on the phones:
1) Put the downloaded
.bin etc. file in the TFTP folder inside the PBX's directory
2) The path that has to be supplied in the "Value" fields should be in either of these formats:
If that still doesn't work for you. Please give Vodia Support a call.