Citation :
2. You DO NOT QUALIFY for iOS5-to-iOS5 restores if you got to your current 5.x via an OTA update
the tickets saved by Cydia, redsn0w, and TinyUmbrella do not cover OTA update ramdisk images even if they did, it’s the “wrong kind” of ramdisk (you’d need to start at that earlier pre-OTA FW)
devices fresh from factory or refurb may fall in the “does not qualify” category (your results will vary)
it’s okay if you previously got to 5.x via an OTA update, as long as your current 5.x was installed via a normal iTunes restore. All that matters is how you got to your current 5.x most recently
redsn0w detects an OTA/normal-restore APticket mismatch very early, so if you don’t know your status there should be no harm in trying. Any device in recovery mode after such a mismatch can boot normally again just by going back to “Even More” screen from the “Restore” screen (or use “Recovery Fix” if you quit redsn0w before doing that).
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