Few OEMs have a whitelist in the BIOS to block unsupported modules. When BIOS detects unsupported module, it keeps the module in reset (using rfkill pin #51) to prevent from OS detecting it. Some OEMs BIOS warns the user on power up and stops booting into OS until the module is changed. OEMs have various reasons (one of them is full system validation) for doing so.
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