Missed a chip! There's an Nordic Semiconductor nRF52840 SoC on the back.
That's a Bluetooth/BLE/NFC/Zigbee chip.
(It's also an ARM Cortex M4. )
Foone🏳️⚧️ (foone@digipres.club)'s status on Thursday, 03-Oct-2024 08:07:12 JST
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Foone🏳️⚧️ (foone@digipres.club)'s status on Thursday, 03-Oct-2024 08:07:12 JST Foone🏳️⚧️