blackberry curve 8520 will not install os 5?

Sana

Member
I have an unlocked blackberry curve 8520. it has os 4.6 installed on it. i have tried installing os 5 numerous times! i get one of these problems each time:
-desktop manager or app loader does not connect to blackberry
-USB always disconnects during the last step.
-fatal error occurs
-os loads, but phone is stuck in constant reboot cycle
-if os loads succesfully, and phone turns on, then it will work for a few minutes/hours until it reboots randomly and is stuck on reboot!
Any help?! please? I really want to download and use OS 5 for my phone!
 
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