Some chips have a calibration value for the internal oscillator and a bandgap calibration value. These are pre-programmed into the new chip by the factory and should be preserved when your new code is programmed into the chip.
Message Prompt
With this option enabled, the OSCAL and Bandgap values will be read from the chip in the programming socket and they will be compared with the values in the loaded HEX file. If there is a difference in the values, a continue prompt dialog will open before programming commences.
Insert Original Into File
With this option enabled, the OSCAL and Bandgap values will be read from the chip in the programming socket and inserted into the HEX file before programming takes place.
Please note that your ORIGINAL HEX file will not be changed, so if you reload it and verify the just programmed chip, it may report an error with the FUSE and at the CAL location.
Use File
With this option enabled, the OSCAL and BandGap values will be programmed from the loaded HEX file.