Posible downgrade after update Iphone3GS 4OS to 3.1.3 (New bootrom) ?

[77an]

Posible downgrade after update Iphone3GS 4OS to 3.1.3 (New bootrom)?
Tnx!

 

[alberht]

Only if you have SHSH saved.

 

[m_mustakeem]

how can save SHSH...

 

[77an]

File SHSH I do not, but perhaps Iphone SHSH before connecting to the server I do not know ... How do I know if a file on the server for this particular Iphone. Can I try your way now?

Tnx!