Hi Im sorry to hear that!
I have been there as well. With LG phones.
With this one you need to send it back to the factory for them to reset the system. The only way they do that is at the factory;-(
I really dont like LG phones myself for many reasons lol and I wish I had better news for you , I really do.
Please contact them about this problem:(###) ###-####Cell phone support.
In any case, I will stick with you until this is complete.
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Thank you and have a great day!