I have a SPH-Da100 app radio 2 with out of the box firmware ( its been installed in a car that was sitting ) 

I've been trying to update the firmware so the headunit will be usable with iPhone 5 and up but I keep running into the issue were it tells me "the version up file can't be read please save only one version up file to USB"

I started off with v8.30 

then I tried v8.17 

somehow I was able to find v8.15 

but all these firmware versions give me the same error message 

is there a firmware before v8.15 and if so does anybody have the firmware file ?