Wifi info is stored on the root partition (partition 1, in /etc/wpa_supplicant/).
Second partition is recovery firmware and should not be modified.
Third partition is user data. To prevent data recovery by forensic expert, you'd have to overwrite the third partition entirely (quick format is not enough).
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(*) there is no sign of life: no led when pushing the on/off switch, and no USB drive gets activated when connected to the computer. My impression is that something on the motherboard is damaged, but so the battery and the screen must be still ok.
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That's super unfortunate. Did you try disconnecting and reconnecting the battery? Or the reset button (pinhole next to external sd slot/usb port)? Sometimes it crashes in a way even holding the power button won't reset, and then you either have to forcibly power cycle or wait ages for the battery to run compeltely dry.
Usually it#s the display that breaks, but then (with microsd card present) you should still see power LED lighting up.