I had a similar problem. My Kindle PW2 was on 5.6.1.0.2 with the Back Door Lock in a locked state, yet somehow my Kindle still did a silent update to 5.6.2.1. Luckily this didn't break the jailbreak, or I would have been quite bummed. Just had to reinstall my screensaver hack (actually the only reason I use my jailbreak).
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