Tried searching for a scenario same as mine but cant find any. So I am running tethered jb ios5 on my 3gs but never really got concerned on preserving the basebands so mine is now at 5.16.05. I read about old posts saying going back to 4.1 and then up to ios5. But since ios5 is no longer getting approved by apple is this not a viable solution anymore? Any clarification from others is greatly appreciated. Wish I can just update the baseband directly since I already have it jb'ed. Thanks in advance!