iphone 3gs keep error 1015

[alvintschoong]

I use auto restore from itune and my iphone was hang up and i tried 2nd time then error 1015 and then i tried and tried hundred times following the instruction from apple ......error 1015 too.Now itune detected my iphone none IMEI number none everything. Plz teach me how can i fix it.

[iYeow]

Use redsn0w to put you into DFU mode and restore to custom firmware without ipad BB in it.

[alvintschoong]

i'll have use redsn0w to put into DFU mode and it said your device should now be in pwned DFU mode (and the screen should be black)In this mode,it should accept custom IPSWs from iTune. Done!
And i go Itune to restore with custom firmware but still error 1015

i hv tried a 2nd time its work. Ty alot for ur time and ur info

I have another question. Once I have done my "error 1015", It was still in emergency call screen. Thus, my sim card cannot support the iPhone because it is locked. How can I complete the restoring so I can unlocked it by using my sim card?