If it gives you an error, try doing this when loading online to BO2.
1. Start up your PS3 without Signing into PSN
2. Load up BO2
3. Sign into PSN from the XMB
4. Wait a few seconds then Play Online
This method usually works for myself and everyone else I play with on CFW. If it doesn't work for you, it's definitely being caused by the EBOOT in which you can find trusted and working EBOOTS
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