That will never work.
You cant simply adapt RJ11 to RJ45, the pins arent compatible its not simply a differant type of connection.
Even if you did the modem has a much slower speed than the official LAN or BB adapter.
If you wanted to build your own ethernet adapter, it is possible but you'd need to know alot, your best bet would be to try to reverse engineer the official ones, its not an easy task, others have tried before and gotten it working but the expense and effort of making it could of easily covered the excessive cost of buying a bb adapter.
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