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Although you're completely right: The current firmwares are VERY, VERY aggressive in trying to auto-update the fw if connected to the internet. So you MUST do the registration in a hurry, and then switch off WiFi immediately before the background download of the OTA fw is ready. WLAN is getting faster and faster ... the time it takes to download these roundabout 200 MB might be REALLY short...
That's why I always propose to check at first if the out-of-the-box Kindle can be regognized as USB storage already. If so, write the OTA blocker dir. If not - and ONLY! if the Kindle isn't accessible as USB drive - register it. And, as mentioned: Do that in a REAL hurry. Make sure your attention will never ever be deflected by, e.g. a ringing phone ... otherwise, while answering the call, it could be to late; leaving the connected Kindle alone for some minutes without the OTA blocker dir WILL start the unwanted OTA update, thus avoiding the jailbreak...
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