Missing SPLIT option

I’ve got a problem. I’m looking for SPLIT option but while I’m holding INSERT down, there’s only two options (one of them is POST I think, can’t remember the second one) I’m worrying I may have some buggy firmware but as I remember from tutorial videos I’ve got “S” mode under MATH section so I assume it is the latest one.
Any clue what I’m doing wrong?

What version of the firmware are you running? The split option was added in v2.04 and we are now on v2.09: