well that depends, how did you lock it? if you used xboxhdm and did it from the floppy then it should have a record on the floppy of the code you...
try to hook your hard drive up as a slave using the jumpers on the back of the hard drive cxbox tool will not see it if its a master on the slave...
error code 5 means that the hard drive is unlocked. you need to lock it again the only i know is described above.
ok here you go.. you will need to get a copy of xboxhdm from somewhere. click the make iso file then burn it to a cd-r. done good. then what...
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