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If that does not resolve the issue, try the USB issue-resolution steps and articles listed for Error 1604. Supposedly reinstalling the USB drivers fixed the problem.
If the issue persists, it may be related to conflicting security software. Replace the USB cable with a newer one and/or disconnect all other USB devices, then retry.
Restart computer; change USB port; reinstall system.
Restart computer; change USB port; reinstall system. Known on damaged bundles from unofficial Pwnage Tool distributions or bundles.
Most of the errors can be found at Apple's Knowledge Base. Some have seen success afterwards by doing the downgrade from DFU mode instead of the normal Recovery mode. This is caused by a failure to match the Baseband Nonce currently in memory to the nonce returned in the Baseband Firmware SHSH blob.Before a series reaches GA status, new codes may still be under development and subject to change.Server error information comes from the following source files. Check system time, reset Internet connection, update root certificates. This occurs when the media library on the device is corrupt and cannot be modified or updated. Permission error either on your computer or the device. Also occurs in restore logs as "unable to convert ramrod 1004." Seemingly caused by a modem firmware chipset malfunction or faulty dock connector, the only fix is to either heat up the chipset or replace the dock connector.