@CaelThunderwing: For this specific purpose (AFAIK), a KSO is strictly identical to a classic Kindle, so it shouldn't be any different. And, unless you have the wireless on, and a pending official update (even then, I'm not so sure about that), the update option shouldn't disappear. And a failed jailbreak install certainly wouldn't jailbreak a Kindle (on FW 3.x), especially not a U004 error [which would more likely indicate that you're trying to run a jailbreak install not targeted at your specific Kindle version [>= 3.2.1], which your first message here confirms).
Since you've been able to install custom hacks since, my best guess would be that, on top of using the wrong .bin file, [and not uninstalling your previous jailbreak if your intent was to update it], your Kindle was already jailbroken anyway.
Last edited by NiLuJe; 11-04-2011 at 05:58 PM.
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