I have a slingbox 350 everything works but i cannot change the channels on my ipad
Does it work OK on a PC ?
Yes but not on my smartphone or iPad.
No quick answer then I'm afraid. Sorry.
It used to do it but then it stopped. How do I connect it to my laptop to try and update the system?
You don't connect it. While you are viewing it (you said it worked OK on the laptop) simply click Settings > Reconfigure inputs
Retrieving data ...