My iphone 4 get out of network!!!PLEASE HELP

[tanvir5971]

I'm using a iphone 4, brought from Canada used with Rogers oparator. For last 2 months i used in Bnagladesh by GEVEY SIM to manage network. but when i upgrade my device from iOS 4.3.3 baseband 4.10.01 to iOS 5.1 baseband 4.12.01, my network get lost. Accidentally i didn't save my SHSH blobs of previous version iOS 4.3.3 baseband 4.10.01. i dont know how to make it work right now. please let me know how can fix it out. so that i can use it in Bangladesh with Grameen & Airtel oparator. or how can i restore my baseband from 4.12.01 to 4.10.01. or any other ways to fix it out...reply me as soon as possible GUYs. thank you.

Asadul Hossain Tanvir
Sr. video Editor, R&D, QC, BO&E
Jamuna Television Ltd
Bangladesh.

 

[zig9449]

Now you have to use SAM to unlock.

You cannot update an unlocked iPhone without using a custom IPSW or the basebamd gets updated, and cannot be downgraded. iPhone unlocking 101............Rule #1 DO NOT RESTORE TO STOCK iOS.

Thankfully there is a new unlock method that can unlock iOS 5.1 on any baseband. That unlock method is SAM.