how downgrade 3gs 4.0(8a293) 05.13.04 to 3.1.3-help

[zonetrichur]

i have a 3gs 4.0(8a293) 05.13.04 to unlock

can i downgrade and unlock?

help me

thank u

 

[Ayash Wadhwa]

If you have shsh bloobs file saved then possible .

If not then not possible at that moment