Locked iphone & Stucked in low battery icon

[d4nubi]

Help me!!! Can anybody help me please....
My 3GS 3.1.3 got locked when i upgraded it from 3.1.2
Now it stucked in Low battery icon...
Restoring it using itunes doesn't help cause it stopped with an error
Looks like this:

 

[Myzhi]

Believe, Apple stop signing OS 3.1.3. That's probably why you are getting "device isn't eligible" error. Thus, you will need to restore using OS 4.0.

Unless, you have your OS 3.1.3 SHSH saved with Cydia. Then, you can point Itunes to Cydia server to restore with OS 3.1.3. Google for instructions.