iH8sn0w has updated his iREB tool.
iREB has been updated for the first time in ten whole months; now dubbed iREB 5. It's a tool made by iH8sn0w
that lets you get out of any restoring errors (such as 1015) when trying to restore with custom firmware. It has been updated with some really minor improvements, but improvements nonetheless. It doesn't yet work with the iPhone 4S or iPad 2 because there are no bootrom exploits