nexus s can't reset, can't wipe data

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nexus s can't reset, can't wipe data Hurelhuyag 10/6/12 5:03 AM
I can't flash nexus s.
always return "FAILED (remote: Erase Fail)"
 
fastboot oem unlock
same result
 
and 
can't wipe data, can't factory reset

now what I do?