When we first got our Camry Hybrid with Entune, we could use Pandora with my iPhone 4. Now everything links up and appears to be OK, but the sound does not come through. My iPhone 4 is running iOS 6.0.1 (10A523). My son's iPhone 4 is running iOS 5.0.1 (9A405) and Pandora works fine with his phone hooked up.
How can I get my iPhone back to iOS 5.0.1 (9A405)?