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You can guess it by looking at the serial number.
There are four groups of four characters in the serial number. You need the third group. It represents year, week, and day of manufacturing. Like 322X is year 2023, week 21, any day. If it’s that or lower, then you’re good, JB possible. If it is higher than that, then 90% that FW will be 5.16.3 or higher. Although some users reported that even late production Kindle had low firmwares too
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