My Blackberry 8520 won't let me download the App World

Hi,
I recently got my Blackberry 8520 unlocked to all networks. As I turned it on, the BlackBerry App World was gone as were a few other things and my BlackBerry Messenger was not working properly. I could not recieve messages or send them. I installed the BlackBerry User Tools disk on my laptop and re-installed a few things but they still would not work and the icons were not there. I also tried to download them off the internet on my BlackBerry and it went as far as the language selection and then when I clicked select language, my phone brought me to the BlackBerry logo and just stayed there and nothing happened.
Can anyone tell me why this is and what I can do please?
Thanks.

colin-1977 wrote:
Sorry. I changed the Wi-Fi diagnostics to advanced settings and there are three green ticks beside Association, Authentication, and DHCP. Are they the same things that are mentioned in the KB20055 article?
Thanks.
Hi,
Nice catch on the diagnostic option change!
I always run the advanced display, its always better to have as much detailed information as possible when you are troubleshooting a problem.
What you described is not the Blackberry Infrastructure section referred to in the article. The first part of the test under Wi-Fi  contains the options you mention. These results refers to your device negotiating and connecting to your home router only.
Shrink the results by clicking the first two categories of the test. The Blackberry Infrastructure is the last category. Here are my test results for reference and the options in blue.
+WI-Fi
+VPN
- BlackBerry Infrastructure
Address Used: //rcp1.us.blackberry.com:443 IP Used: 68.171.242.57:443;49260
Connecting: Successful
Authenticating router: Successful
Authenticating server: Successful
Last Contact at: Jun 11, 2012 08:48
Certificate status: Ok
Do you have this section?
Thanks,
Bifocals
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