I usually keep WiFi off on my reading devices. Your client seems a bit further along than me.
This might be impossible. My Poke3 has a Qualcomm Snapdragon 636 processor and the WiFi interface is built right in. Ok, you might sabotage the antenna, but that's not really 100% certain either.
Older model things had a WiFi module that connected on SDIO to the main processor. Bluetooth often had a module that connected over a UART port. Those were easier to identify and remove.
Since the Nova3C is of the latest generation I don't think this will work out. Do we have some good photos of the inside of the Nova3C?
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