Iphone 3gs new bootroom constant reboot after redsn0w jailbreak

[Johan Carcamo]

Hello I have an issue with a iphone 3gs.I recently jailbreak this iphone but after the jailbreaking it is constantly rebooting.The version of the ios the iphone had was 6.1.3 and after the jailbreak it become 6.1.6.I tried to erase the jailbreaking but itunes throw me an (-1) error.How can I fix this so I can leave it without jailbreak.Any suggestions? Thanks