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Rajesh,
I am not familiar with the larc version software.? I am pretty sure that it will not work with the KD8CEC Memory Manager, though it does appear to have a CAT routine.? A quick look at the code also suggests that the menu functions are the same, so the standard v3 or v4 process should work.

1 - Set the BFO first to be able to receive an AM signal.
2 - Calibrate the frequency displayed
3 - Reset the BFO

Setting the BFO and the Calibration should be a menu item that comes up after you turn on the settings option in the menu system.? For each of the 3 calibration steps, you will need to perform the following:
a - Press the encoder button to enter the menu
b - Rotate the encoder to get to the settings selection
c - Press the encoder. The screen will go back to the frequency display.
d - Press the encoder again to enter the expanded menu selections
e - Select either the BFO or Calibration option depending on which step in the process you are on.
f - Perform the process
g - Press the PTT to save the value
h - Wait 15 seconds for the data to be written to the EEPROM
i - Turn off the rig and then turn it back on to test the new setting.

For the BFO setting, I use the BFO Tuning Aid from Ashhar Farhan:

The steps are explained in the video for the v6, just remember that the controls are different, The steps, how to use the tools, and results should be the same:


The way that I would approach getting the rig updated would be to first get it working as it is, doing the calibrations and verifying that all is working.? I would then go to the KD8CEC firmware (software) using the same Nano, as that is where the calibrations are stored.? If you want to save the current Nano as is, then you will need to redo the calibration steps on the new Nano to get it aligned correctly.? The last thing would be to upgrade the display.

I hope the above is clear enough to get you going in the correct direction.
73
Evan
AC9TU