Error:
The application operette $2dhifi has attempted to open a connection to a location inside the firewall and outside the firewall which is not allowed by your IT policy

If you are getting the following error message when you are trying to install the Opera Mini Browser into your Blackberry, then most likely the firewall is blocking it.

There are several ways you can fix this,

1. Remove the Firewall (IT Policy). If this is your personal Blackberry, you can disable the firewall on the device and this will work. If this is a company Blackberry, you might want to check with the IT department for your company. If you are nice to them, they might remove the policy for you.

2. Check the TCP settings under Advance Settings. I know for T-mobile users the device needs to have the wap.voicestream.com setup on the APN, Username and Password can be blank. For other service providers, check with your phone company.