How to enable CCS1 adapter support on Model 3 and Y

Note! Tesla has officially released the CCS1 adapter for North America as of Sept 21, 2022. You must have the CCS adapter support enabled FIRST in order to buy one from their store. This means you need to do one of the applicable retrofits (A or B) below. The key is to get the Gen4 ECU from your Tesla Service Center. There has been more successes at the local SCs now that Tesla has announced support for CCS for NA cars. It's worth another shot if you were previously unsuccessful as these parts are not restricted.