Restore Errors/-100 to -1

Error -54
Unknown error.

Error -50
Reinstall iTunes. See also KB TS1583.

Error -35
Error when downloading songs purchased on iTunes. Also see KB TS1475.

Error -1
Error occurs when one uses the "last ditch" method for preventing baseband updates on the iPhone 4. The baseband does not get updated using this method. Use TinyUmbrella or redsn0w to kick it out of Recovery Mode.