Drained transmission fluid instead of engine oil during an oil change

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Locating the fill hole using online images or direct messaging for guidance
2. 2
   Considering pumping the fluid back in through the drain hole
3. 3
   Draining the extra oil, refilling fluids to the correct levels, clearing the codes, and driving to see if errors persist
4. 4
   Taking the car to a professional mechanic for service instead of doing it yourself

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.