Having the same issue i follow this topic. I do also have a NON SKS Prius (not button on latch or under steering wheel). BUT, my key has a silver Toyota logo . No idea how this is possible. I think that someone bought a new housing for both keys. That is why I think that i also need to delete some keys from the memory to be able to program this two. Can this be done using Techstream?
I am not able to change my question above that is why I place some updates here. I found out , that I have 2 SKS keys. And as my car does not have the KEY button under the steering wheel or black buttons on de door latch i know for sure that i have a non sks Prius. And fact that the SKS and Non SKS key use a different frequencies, i will never get this to work. need to find me 2 non SKS keys and reprogram them to my car
