I dont know of anyone that got an official invitation email specially for them to get the upgrade (please correct me if some of you did). Others like myself got the general email that described the $2,500 MCU2 upgrade program and it stated that they were “now scheduling” for cars with MCU1/HW2.5/FSD to get the upgrade.
Based on that initial (not specific to me) email I scheduled and got the upgrade. I just went into the app and scheduled service for the 1st date available and selected “interior” then “touchscreen” then typed in “MCU2 Infotainment upgrade” In the description. I got scheduled, and they did both the MCU2 (MCU and IC) and the HW3 upgrade without question. Total was $2,500+tax. So I dont know if anyone is actually getting invites.