Can OTA's be reversed if necessary

[tearitupsports]

I am curious to know if it is possible to revert back to older code in order to reverse out an OTA in case it has something that is not wanted in it.
In my specific case with my bi-directional charger, I am very hesitant to allow the truck to do update OBCC-AS.AU (which I have been offered) since it is specific to the DC charging. I am worried that the update could possibly break something and not allow bi-directional charging.
I would feel more comfortable doing the update if I knew it could be backed out to the previous version (even if that is not easy to do). Does anyone have absolute assurance of how this works one way or another?

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[TaxmanHog]

I am curious to know if it is possible to revert back to older code in order to reverse out an OTA in case it has something that is not wanted in it.
In my specific case with my bi-directional charger, I am very hesitant to allow the truck to do update OBCC-AS.AU (which I have been offered) since it is specific to the DC charging. I am worried that the update could possibly break something and not allow bi-directional charging.
I would feel more comfortable doing the update if I knew it could be backed out to the previous version (even if that is not easy to do). Does anyone have absolute assurance of how this works one way or another?

I've never heard of anyone being able to revert to prior code if the package was installed correctly.