Iphone 4 error 21, DFU mode doesnt work, hosts file is fine,

have the iphone 4 and I haven't used it since February 7th and its April 14th now and its stuck in recovery mode. I put it into DFU mode and it still doesn't work, everything is fine and I still can not find a solution, please help.

"Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article to resolve this issue."

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