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I wouldn't worry much about updates on your 9th gen. It's been stuck at that jailbreak-vulnerable version of the firmware for a year and a half, along with the 7th and 8th gen devices. The only devices still getting updates are 10th gen and newer. If it was important to Amazon to block jailbreaking on it then they've had all the same chances to do so that they've actually used on newer Kindles.
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