The home button on my jailbroken iPhone 4 (4.3.1) is flaky, so I set up an appointment at an Apple store to get it replaced. I've since read that the latest firmware versions aren't jailbreakable (4.3.4, .5). I've confirmed that my SHSH blobs are saved in Cydia, though I'm guessing that only applies to my current hardware. Can someone confirm whether I can expect to jailbreak a warranty replacement iPhone? (Or downgrade and jailbreak.) Does Apple always send replacement phones out the door with the latest software? Thanks.