Default Help! can't synchronize after Qtek 2020i rom update

Help!!! I'm using Qtek 2020i. Updated to o2 blackberry rom today with excitement. But I can never get my synchronization work again!
Really painful!
This is the error message in my handset:
unable to connect. You may have lost network connectivity. Try again. Should the problem presist, reset device.

What can I do??

Thanks a lot! :?: :?: :?: :?: :!: :!: :!: