Lost La2 Function?

[stevesingo]

I have an M800 which I'm sure I had upgraded to Dual Lambda and tested the function during installation, but not used it since.

I have upgraded the software to v3.54 since the initial install.

Today I tried to air cal a replacement sensor. La2 showing "off" in the sensor screen? Checked the status on the ECU manager screen, and Lambda 2 is not showing in the list of upgrades.

So the question is, can you loose upgrades during a software upgrade?

Steve