Hi there, I`m new here.
I got a fastrack supreme 20, with a Application OS v 04.24 and firmware v663f00gg.FSU002;
I suspect that i must get Open AT® SDK v4.22 to download the application on the modem. Otherwise i get a ERROR IN HEADER message when i try to download it to the modem; My question is from where can i get it? 
Any help would appreacite;
Greetings;
Edit; I found the archive.sierrawireless.com, but dont know really if there is something that i need;
I downloaded the old sdk and imported it.
Resolved.