Those of us that own an i3 with a 3G Telematics module (TCU) have been told by BMW that we're out of luck and there is no "technology upgrade" available to keep ConnectedDrive services running past Feb 2022. I received the email from ConnectedDrive services stating as much and I'd get free services until the end date, even though I had already renewed service until Nov 2021, so 3 months free. Some laughed it off and have let their subscriptions lapse long ago. I for one like the ability to set the car to cool before I get to the door, and real time traffic is very useful to avoid jams along my routes.
I read posts of the 4G TCU part number that directly replaces the 3G TCU, posts of other BMW model owners talking about the upgrade and a single post of an i3 owner that got their broken 3G TCU replaced with a 4G one under warranty. I decided to get my 3G TCU replaced when I brought my i3 in for HV battery warranty test (see other post). All out of pocket.
I gave the service rep the 4G TCU part number (84-10-6-836-777) to order because I was not sure they would install if I bought it outside of their supply chain, and put the work order to replace the 3G one and program its replacement. At first they sound unsure that this could be done but I replied that the only thing needed to be done is to program with ISTA+, which I don't have access to and no expertise to use it. Maybe contact ConnectedDrive in addition.
So when I went to take back the car to await the arrival of the replacement battery modules they've already replaced the TCU, and I successfully activated cooling as I walked to the car. They gave me the 3G TCU as a keepsake, and I managed to query the tech that performed the upgrade. Sure enough, the only thing they had to do is program the TCU using ISTA+. Looks like it is a drop in replacement.
I still need to contact ConnectedDrive to make sure they don't deactivate my VIN when Feb 2022 rolls around but it has been working fine for about a month now. All it cost is ~$1400 parts and labor. I'm sure if you order the TCU online and/or have access to ISTA+ the costs would be lower than having the dealership do everything but this proves:
BMW is full of it when they tell you that there is no way to upgrade your TCU. They just don't want to put up any money even for a discount.
Here are pics of the work order, plus old and new module and its connectors.