By accident, I updated my iPhone 3GS (old bootrom) from iOS 4.0.1 to iOS 4.2.1. I downgraded it back to iOS 4.0.1 so I can unlock it, but the baseband remained the same as the one on iOS 4.2.1 (05.15.04). Is this normal? I have read from various sites that if I downgraded my iOS back to an older version, it would also downgrade my baseband. NOTE: I have all my SHSH saved! Any help would be appreciated!