Why is my LG magna flickering?

[AC Question]

When I was playing with the developer options I pressed on simulate secondary display then I pressed the 4K option then my phone started flickering and I cannot use my phone anymore pls help and sorry if you cannot understand because English is not my main language but pls help me =(

 

[the tall guy]

Hi, probably best not to mess about with developer settings going forward. Also have you tried resetting your device?

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