I have an iPhone 4 with iOS 4.3.3 and baseband 4.10.01. I would like to upgrade to iOS 5.0.1 but am keen to have the option to go back to 4.3.3 (I've already saved my SHSH blobs). My concern is regarding baseband, I know that if I upgrade to 5.0.1 through iTunes, BB will be permanently upgraded to 4.11.08. Is it OK, generally, to mix and match baseband and firmware? So if I later downgrade, would iOS 4.3.3 with 4.11 baseband throw up issues?