There is a key to hold as well as holding power button for a reset, but it wipes content and registration
https://techsynchron.com/how-do-i-re...ndle-keyboard/
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A factory reset for the Kindle Keyboard requires accessing a hidden diagnostic menu. Plug your Kindle into its charger. Then, simultaneously press and hold the `Menu` button and the `Back` button for about 30 seconds until a diagnostic screen appears. Use the directional pad to find the ‘Factory Reset’ or ‘Wipe Device’ option and select it.
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https://technicskeyboard.com/how-to-...ndle-keyboard/
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Method What It Does When to Use My Verdict
Quick Restart (Power button 5 seconds) A gentle reboot, clears temporary glitches. Minor unresponsiveness, slow performance. Good for everyday sluggishness.
Hard Reset (Power slider 40 seconds) Forces a complete shutdown and restart. Clears memory. Frozen screen, unresponsive buttons, system errors. The go-to fix for serious software hangs.
Factory Reset (Settings menu) Wipes the device completely. Deletes all data. Selling device, persistent issues after hard reset, corrupted software. Last resort. Use with extreme caution.