[Q] Nexus S doesn't boot after format system

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http://forum.xda-developers.com – Hello to everyone. I have a great problem with my Nexus S. Today I have done a factory reset, format sd and format system from clockworkmod recovery to install another rom (Jellybam rom). I've do this but now the phone doesn't boot. I see the first image with the lock in the bottom of the screen then only a black screen. I can go to the recovery yet. Is there a possibility to restore my phone?? Thanks for answering. (HowTos)