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1/ Reversing the firmware of STB could be easy or difficult depending whether or not it is encrypted or not. It will depend too on the CAS Provider requirements (nds, irdeto, ...).
2/ In order to capture packets, find a hub or a switch with a mirrored port capability and set your PC on that port; then give Wireshark a try : it's powerful tool: you can decrypt all kind of traffic: dhcp (bootp), udp, ...
Cheers
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