iPhone 5c network problem now error ,-1,37

i have iPhone 5c which was loosing network with low wifi range. i gave it to repair shop after few days the guy returned it to me saying that he can't do it. the phone was turned off completely means it wasn't turning on he said to me it needs to be restored. i was in hurry because i need shifting from that place. when i tried it to restore by iTunes it gave me error 50. i downloaded the file again & tried but got error -1. i made a dfu file by redsnow & tried & it gave me error 37. now i am completely stuck at errors. if somebody can help me i will really appreciate.
thanx

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iPhone 5c network problem now error ,-1,37