Sorry ,didn't mean to.
I had a usb to nine pin but it didn't work - tried different drivers etc. but no luck. Maybe too old? Yours maybe ok though!!
Eventually I hard wired 2 x 9 pin ends from the pc to the box( as per wiring in thread mentioned above) pins 2-3, 3-2 (hand shaking is just more pins used), standard 232 only uses 3 pins.
I could then communicate with the box and tried a few files (as advised in the thread) and eventually it fully loaded.
I'm assuming once you get the right erom upgrade for ios the same file to load will do?
p.s
Maybe continuing on the old thread might get a better response?
Good luck