I was looking at a forum site for the LG Optimus 4X HD and found some techniques that work on the LG Optimus 4X HD. Enter 3845#*880# send, you will then be prompted for the service code, various options like factory reset, tests, GPS tweaking, fm test, audio, screen tests and much more!
Warning: you should never make any actual changes in the Service Menu unless you know what it will do.
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