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The security code can be changed and still be in effect with all locks off. Try 6 0's (000000). I didn't see that listed in the things you've attempted. If its been changed, the only way to determine that is to contact the previous owner and see if they remember it. If not, it will have to have all new software written to the phone. Basically like a format / reinstall.
Please help, I flushed my phone's GDFS file to my friend's M600i and it seems locked phone code and can not boot this phone. Do help me to get Master Reset key, the phone's information : IMEI:35931500-401250-5. thks !