My unit is an original and has been updated when they sent out the notice some years ago. That's as far as my unit been updated. I have contacted Lionel and they advised me to buy the 691MMBU003 version 1.3 base module and 691MMRU003 version 1.3 remote module at $10 each with a $10 shipping charge. Unfortunately the Lionel store is closed because of the current situation.
I should be register with Lionel since I did send the unit back for the original upgrade.