I don't think yellow one is for ibus,I configured my tx to ppm first,by setting it to ON.And I did not touch anything related to ibus on my tx,I just went betaflight,with my white wire on rx pad.It didn't work at first,but magic happened when I replaced white wire with yellow wire on rx pad,it worked!.So it must be yellow one which produces ppm.I did not even set my receiver mode to ibus,I just left it to ppm.Now the only problem is my cell.I just don't know how to charge it,because it doesn't have a balance cable.A friend of mine told me to charge it directly by setting the imaxb6 charger to 1s 3.7v.It is just buzzing,I don't know why.