Help Unlocking LG C550

Please help with the method to signaling unlock cipher for LG C550. I proven every the LG methods without sim card, with example sim card, with a Not Accepted sim bill already, and NONE works. All these beneath do not entireness so gratify help!!!

2945#*550#
2945#*71001#
2945#*700#
*#865625#
2945#*88110#
815118#*#
277634#*#

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