Probably won't work
You recall that the Sony reader runs a 2.4 Linux kernel. Plugging in a wifi card would require
a driver. The 2.4 kernel might not support that driver, even if a Linux driver is available and that is by no means a certainty. And, even if there is a Linux driver, it might not work on Sony reader hardware with SD wifi card. And, even if driver is available and would work,
how would you hack the Sony reader in order to install it?
Sorry, too many hurdles to jump over.
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