No network - Please Help

[PartisanEntity]

Okay,

I was testing Os 3.0 Beta2 for a while, then I used the instructions on gizmodo to downgrade to 2.2.1 again.

However I now have no network after unlocking my sim card.

Please help!

Thank you.

 

[PartisanEntity]

Okay, I attempted the downgrade several times and eventually it worked.