Stock rom flash error

I'm now trying for several times to flash the stock 4.1.2 rom on my galaxy S2 i9100, but unfortunately at the end of the phone will always restart with the old rom.All steps do not give error.
I do not know what to do.....:confused:
Can someone help me?
I use
odin 1.85 or 3.10
stock rom 4.1.2 I9100XWLSW_I9100XXMS3_I9100ITVLS2_HOME.tar
pit for file stock rom I9100_2GB-STOCK.pit

Thanks:good:

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